Answer: 1.6 hours.
Step-by-step explanation:
Ok, the speed of the bats is 99mph.
Here we can think this situation as a circle where the radius is growing at a speed of 99mph.
We assume that the initial radius is r = 0, and we can write the equation of the radius as a linear equation that depends on the time t.
r(t) = 99mi/h*t
First, let's find the radius that we need:
The area of a circle is:
A = ´pi*r^2
If we want A = 80,000 mi^2 we have:
80,000 mi^2 = 3.14*r^2
r = √(80,000 mi^2/3.14) = 159.6 mi
So the radius must be 159.6 miles.
Now, we know that the speed at which the radius increases is 99miles per hour, and we also know that:
Distance = Speed*Time.
in this case:
Distance = 159.6 mi
Speed = 99mi/h
Time = is the thing we want to find.
159.6mi = 99mi/h*T
T = 159.6mi/99mi/h = 1.6 hours.
Which number produces ab irrational number when multipled by 4
Answer:
Step-by-step explanation:
Hello, any irrational number multiplied by 4 is an irrational number.
For instance, you can take
[tex]\boxed{\sqrt{2}}[/tex]
Thank you
CORRECT ANSWER GETS BRAINLIEST!!
Answer:
Step-by-step explanation:
To have Distance proportional to time, the person or object must keep a steady or constant rate like speed.
Let's first look at A runner sprinting in the 100 meter dash, since it tells you nothing about time it goes to not enough information.
Now look at An airplane starting at the end of the runway and taking off, it tells you nothing about time so, not enough information.
Now on to A marathon runner jogging at a constant speed for 45 minutes, this is distance proportional to time, because the runner has a constant rate.
The graph is distance proportional to time because, a straight slanted line indicates a constant speed. If it were curved it would not be constant.
The table with the number is distance not proportional to time because if you find the slopes of (25-5)/(10-5) and (50-25)/(15-10), they are 4 and 5 respectively which means there will not be a straight line on the graph.
Lastly, an airplane traveling at a constant speed across the country is distance directly proportional to time because it has a constant rate which is speed.
Match the correct rational number to its equivalent repeating decimal: 27.33333
A. 82/3
B. 100/3
C. 42/4
D. 22/7
Answer:
A. [tex]\frac{82}{3}[/tex]
Step-by-step explanation:
Step 1: We know .3333... is [tex]\frac{1}{3}[/tex], we rewrite the equation as [tex]\frac{1}{3}[/tex]
[tex]27\frac{1}{3}\\ \frac{1+(27)(3)}{3}\\\frac{1+81}{3}\\\frac{82}{3}\\[/tex]
Therefore the answer would be A. [tex]\frac{82}{3}[/tex]
Answer:
A. 82/3
Step-by-step explanation:
[tex]3\overline{|\smallspace82}\space\space\space\space\\\mathrm{Divide}\:8\:\mathrm{by}\:3\:\mathrm{to\:get}\:2\\\begin{matrix}\space\space\space\space\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ 3\overline{|\smallspace82}\space\space\space\space\space\space\space\space\space\space\space\space\end{matrix}\\[/tex]
[tex]\begin{matrix}\space\space\space\space\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ 3\overline{|\smallspace82}\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\underline{\emptyspace6}\space\space\space\space\space\space\space\space\space\space\space\space\space\space\end{matrix}\\\mathrm{Multiply\:the\:quotient\:digit}\:\left(2\right)\:\mathrm{by\:the\:divisor}\:3\\[/tex]
[tex]\begin{matrix}\space\space\space\space\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ 3\overline{|\smallspace82}\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\underline{\emptyspace6}\space\space\space\space\space\space\space\space\space\space\space\space\space\space\end{matrix}\\\mathrm{Subtract}\:6\:\mathrm{from}\:8\\[/tex]
[tex]\begin{matrix}\space\space\space\space\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ 3\overline{|\smallspace82}\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\underline{\emptyspace6}\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\space\space\end{matrix}\\[/tex]
[tex]\mathrm{Bring\:down\:the\:next\:number\:of\:the\:dividend}\\[/tex]
[tex]\begin{matrix}\space\space\space\space\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ 3\overline{|\smallspace82}\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\underline{\emptyspace6}\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\emptyspace2\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\end{matrix}[/tex]
Divide 22 by 3 to get 7
[tex]\begin{matrix}\space\space\space\space\emptyspace2\emptyspace7\space\space\space\space\space\space\space\space\space\space\space\space\\ 3\overline{|\smallspace82}\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\underline{\emptyspace6}\space\space\space\space\space\space\space\space\space\space\space\space\space\space\\ \space\space\space\space\emptyspace2\emptyspace2\space\space\space\space\space\space\space\space\space\space\space\space\end{matrix}[/tex]
Multiply the quotient digit 7 by the divisor
and sbtract 21 from 22=1
= 27 remainder 1
In a state's Pick 3 lottery game, you pay $1.15 to select a sequence of three digits (from 0 to 9), such as 966. If you select the same sequence of three digits that are drawn, you win and collect $258.35. Complete parts (a) through (e).
a. How many different selections are possible?
b. What is the probability of winning? (Type an integer or adecimal.)
c. If you win, what is your net profit? (Type an integer or a decimal.)
d. Find the expected value. $ (Round to the nearest hundredth as needed.)
e. If you bet $ 1.15 in a certain state's Pick 4 game, the expected value is negative −$0.89. Which bet is better, a $1.15 bet in the Pick 3 game or a $ 1.15$ bet in the Pick 4 game?
Explain.
A. Neither bet is better because both games have the same expected value.
B. The Pick 4 game is a better bet because it has a larger expected value.
C. The Pick 3 game is a better bet because it has a larger expected value.
Answer:
A) 1000 different selections
B) probability of winning = 0.001
C) Net profit on winning = $257.20
D) E(y) = -0. 89165
E) Option B - The Pick 4 game is a better bet because it has a larger expected value.
Step-by-step explanation:
A) For the different selections possible, since each of the digits from 0 - 9 can take a total of 10 digits, then the different selections possible will be = 10³ = 1000 different selections
B) To find the probability of winning, since only one pick can be a winning one. Thus probability of winning = 1/1000 = 0.001
C) Net profit on winning = Amount won - Amount staked
Amount won = $258.35
Amount staked = $1.15
Thus;
Net profit on winning = $258.35 - $1.15
Net profit on winning = $257.20
D) If we call the net profit "y", then Expected value is:
E(y) = 257.2(0.001) - 1.15(1 - 0.001)
E(y) = 0.2572 - 1.14885
E(y) = -0. 89165
E) We are told that:If you bet $ 1.15 in a certain state's Pick 4 game, the expected value is negative −$0.89
The expected value of -0.89 in pick 4 is better than that in pick 3 because it's larger.
Choose the number that belongs to the set described. i don’t understand this, someone please help me!
Answer:
1). Option (H)
2). Option (C)
3). Option (C)
4). Option (G)
5). Option (E)
Step-by-step explanation:
(1). Integers are the ''whole numbers''.
Therefore, negative integer will be a whole number with negative notation =(-8).
Option (H) will be the answer.
(2). "Numbers that can not be written as a fraction are irrational numbers"
Option (C). √7
(3). "Whole numbers are the basic counting numbers starting from 0"
Option (C). 0
(4). A rational number is a number that can be written as a fraction(in the form of [tex]\frac{p}{q}[/tex].
Option (G). [tex]\frac{3}{4}[/tex]
(5). "All positive integers are the natural numbers."
Option (E). 12
If 4x— 3 = 2x + 9, then x = ?
x=6
x=2
x=1
x=3
Answer:
x=6 is the answer
Step-by-step explanation:
4x-3=2x+9
adding 3 on both sides
4x-3+3=2x+9+3
4x=2x+12
subtracting 2x on both sides
4x-2x=2x-2x+12
2x=12
dividing 2 on both sides
2x/2=12/2
x=6 is the answer.
hope it will help you :)
Step-by-step explanation:
4x - 3 = 2x + 9
Bringing like terms on one side
4x - 2x = 9 + 3
2x = 12
x = 12/ 2
x = 6
What happens when the two addends have opposite signs and the number with the larger magnitude (size) is positive?
Answer:
The smaller addend is subtracted from the bigger addend
Step-by-step explanation:
Represent the two numbers with a and b such that a > b
So, the mathematical representation will be
[tex]+a + (-b)[/tex]
Open the bracket
[tex]+a -b[/tex]
This implies that the smaller addend (b) is subtracted from the bigger addend (b)
Take for instance; a = 6 and b = 4
This gives
[tex]+6 + (-4)[/tex]
Open the bracket
[tex]= +6 - 4[/tex]
[tex]= 2[/tex]
which of the following represents the factorization of the trinomial below x^2-17x+30
Hello, if [tex]x_1[/tex] and [tex]x_2[/tex] are two zeroes, we can write
[tex]x^2-17x+30=(x-x_1)(x-x_2)=x^2-(x_1+x_2)x+x_1\cdot x_2[/tex]
It means that the coefficients in x must be equal, meaning
[tex]x_1+x_2=17=2+15[/tex]
and the constant terms must be equal, meaning
[tex]x_1\cdot x_2=30 = 2 * 15[/tex]
So the zeroes are 2 and 15.
[tex]x^2-17x+30=x^2-15x-2x+30\\\\=x(x-15)-2(x-15)\\\\\boxed{=(x-2)(x-15)}[/tex]
Thank you
Look at this shape:
Which image shows a rotation?
A
B
с
A
B
с
X 2
Practice with our app
Answer:
A
Step-by-step explanation:
Image A shows a rotation. B is a translation. C is a reflection.
Someone, please help me with this.
Answer:
14
Step-by-step explanation:
7x-1+6x-1=180
13x-2=180
13x=180+2
13x=182
x=14
Find the equation of the line that contains the points (2,1) and (6,3). Write the equation in the form y=mx+b and identify m and b
Answer:
y=1/2x+0 m=1/2 b=0
Step-by-step explanation:
You first need to find the slope of this line, the equation for this is.
(y2-y1)/(x2-x1)
In this case it is (3-1)/6-2)
This simplifies to 1/2.
This graph also does not have a +b as when you graph y=1/2x, it already passes through the 2 points shown.
Does the table describe x as a function of y?
х
у
-3
-2
Does the table describe x as a function of y?
O A. Yes, each output y is assigned to exactly one input x.
O B. No, more than one output value y is assigned to the input x-value
OC. No, more than one output value x is assigned to the input y-value
OD. Yes, exactly one output x is assigned to each input y.
-
3
6
0
7
1
7
2
4
3
- 1
Click to select and enter your answer(s) and then click Check Answer.
Answer:
C. No, more than one output value x is assigned to the input y-value
Step-by-step explanation:
Given
х у
-3 -2
3 6
0 7
1 7
2 4
3 - 1
Required
State if the table shows x as a function of y
x being a function of y means
[tex]x = f(y)[/tex]
i.e. x represents the output while y represents the input of the function
Note that each value of y (input) must be assigned to separate values of x (output) for a function to be established
Having said;
Next step: We have to examine the x and y column
In the y column, the value 7 occurred twice (as shown below)
х у
0 7
1 7
This implies that;
Input 7 gives output of 0 and 1.
Hence, this is not a function.
Option C answers the question.
p(a) = 0.60, p(b) = 0.20, and p(a and b) = 0.15 what is p(a or b) choices: A. 0.12, B. 0.65, C. 0.40, or D. 0.80 (Note- This is on AP3X)
Answer:
[tex]P(a\ or\ b) = 0.65[/tex]
Step-by-step explanation:
Given
P(a) = 0.60
P(b) = 0.20
P(a and b) = 0.15
Required
Determine P(a or b)
In probability;
[tex]P(a\ and\ b) = P(a) + P(b) - P(a\ or\ b)[/tex]
Substitute values for P(a and b), P(a) and P(b)
[tex]0.15 = 0.60 + 0.20 - P(a\ or\ b)[/tex]
Collect Like Terms
[tex]P(a\ or\ b) = 0.60 + 0.20 - 0.15[/tex]
[tex]P(a\ or\ b) = 0.65[/tex]
Hence, option B answers the question
Answer
0.65
Step-by-step explanation:
apeeex
Brenda bought a coat for $20. She also paid $1.50 in tax. What kind of tax did Brenda pay on the coat?
Answer:
Sales Tax
Step-by-step explanation:
metric conversions, which is bigger
Answer: 6 m is greater
Step-by-step explanation:
Cm is less than m
Hope it helps
Answer:
25. <
26. <
27. >
28. <
29. <
30. >
Hope it helps!
lovelymoonlight ✨
Simplify the expression:
(10x2 -1 + 4x) + (3 + 5x2 - 4x)
Answer:
[tex] \boxed{\sf 15x^2 + 2} [/tex]
Step-by-step explanation:
Simplify the expression:
[tex] \sf \implies(10 {x}^{2} - 1 + 4x) + (3 + 5 {x}^{2} - 4x)[/tex]
Grouping like terms, 10x² + 5x² + 4 x - 4 x - 1 + 3 = (10 x² + 5x²) + (4 x - 4 x) + (-1 + 3):
[tex] \sf \implies (10 x^2 + 5 x^2) + (4 x - 4 x) + (-1 + 3)[/tex]
10x² + 5x² = 15x²:
[tex] \sf \implies 15 x^2 + (4 x - 4 x) + (-1 + 3)[/tex]
3 - 1 = 2:
[tex] \sf \implies 15 x^2 + (4 x - 4 x) + 2[/tex]
4 x - 4 x = 0:
[tex] \sf \implies 15 x^2 + 2[/tex]
You are at your work study job in the Department of Mathematics and Statistics. You've been asked to
make copies at the copy center. It will 4 minutes to walk there, and 1 minute to get the copier set up
and running. Then you need to make 836 copies. The copier can print 38 pages per minute. It will then
take 5 minutes to walk back to the department. What time will you get back? Will you have time to get
to your 2 PM dass that is a five-minute walk from the math building?
4 minutes to walk there, 5 minutes to walk back, 4+5 = 9 minutes total walking time. Add this onto the 1 minute to get the copier set up and we have 9+1 = 10 minutes so far.
The copier can print 38 pages per minute. There are 836 copies, so 836/38 = 22 minutes is needed to print out all the pages.
So we have 22+10 = 32 minutes in total so far. Add on the last 5 minute stretch (going from the math department to your 2PM class) to get to 37 minutes. You'll need 37 minutes total.
You didn't provide a starting time, but we can subtract 37 minutes from 2PM to get
02:00 - 00:37 = 01:23
Meaning that if you left the math department at 1:37 PM, then you'd do all those tasks to get to your next class at 2 PM exactly, assuming no other things happen. So it's best to leave before 1:37 PM
I NEED HELP PLEASE
name each angle in as many different ways as possible
========================================
Explanation:
To name an angle, we list 3 points on the angle such that the middle point is the vertex of the angle. The vertex is where the two rays are joined (at the endpoints).
So we could say "angle JLG" as you wrote in the first box, or we could say "angle GLJ". This is the same because L is in the middle each time. So the order doesn't matter as long as L is in the middle.
The third way to name this angle is to say "angle 2" or [tex]\angle 2[/tex] for short.
Another way to write this angle is to name it by the vertex point alone.
----------------------
Note: In this case, saying "angle L" is enough info to be able to pinpoint the proper angle. Though in general this naming convention is very limited. If we had other rays attached to point L (say ray LH where point H is not on any of the two rays shown), then writing "angle L" is ambiguous. So keep this in mind.
The Futurists, a rock group, are planning a concert tour with performances to be
given in five cities: San Francisco, Los Angeles, San Diego, Denver, and Las Vegas.
how many ways can they arrange their itinerary if
a.There are no restrictions?
b.The tree performances in California must be given consecutively?
Answer:
a. 24
b. 12
Step-by-step explanation:
a. You can choose from 4 cities for the first performance, then from 3 cities, then from 2 cities, then the last city.
4 * 3 * 2 * 1 = 24
b. Think of the three performances in California as a unit. Within this unit, you can choose from 3 cities for the first one, then 2 cities for the second one, and finally 1 city for the last one.
3 * 2 * 1 = 6
Now you can have the 3 California performances first, followed by Denver, or Denver first followed by California.
6 * 2 = 12
If lim f (x) x →5 = 2 and lim g (x) x → 5= -6 which of these limits exist?
Answer:
E
Step-by-step explanation:
So we already know that:
[tex]\lim_{x \to 5} f(x)=2 \text{ and } \lim_{x \to 5} g(x)=-6[/tex]
So, go through each of the choices and see which ones are correct.
I)
We have:
[tex]\lim_{x \to 5} (f(x)+g(x))[/tex]
This is the same as saying:
[tex]\lim_{x \to 5} f(x)+ \lim_{x \to 5} g(x)[/tex]
And since we already know the values:
[tex]=(2)+(-6)\\=-4[/tex]
So, the limit does indeed exist.
II)
We have:
[tex]\lim_{x \to 5} \frac{f(x)}{g(x)+6}[/tex]
This is the same as:
[tex]\frac{ \lim_{x \to 5} f(x)}{ \lim_{x \to 5} g(x)+ \lim_{x \to 5} 6 }[/tex]
The bottom right one is just 6. Simplify:
[tex]\frac{ \lim_{x \to 5} f(x)}{ \lim_{x \to 5} g(x)+6}[/tex]
Substitute the values we know:
[tex]=\frac{(2)}{(-6)+6} \\=2/0[/tex]
This is a value over zero. Unlike the indeterminate form 0/0, this limit does not exist.
III)
We have:
[tex]\lim_{x \to 5} \frac{f(x)-2}{g(x)}[/tex]
Again, this is the same as:
[tex]\frac{ (\lim_{x \to 5} f(x))-2}{ \lim_{x \to 5} g(x)}[/tex]
Substitute in the values we know:
[tex]=\frac{(2)-2}{(-6)}\\ =0/-6=0[/tex]
The limit does exist and it is 0.
So, the limits of only I and III exist.
The correct answer is E.
Point T is on line segment SU. Given SU = 5x, TU = 2x, and ST = 4x – 3,
determine the numerical length of TU.
Answer:
the length of TU is 6......
The numeric length of TU for the given line segment will be 3 units.
What is a line segment?A line section that can connect two places is referred to as a segment.
In other words, a line segment is just part of a big line that is straight and going unlimited in both directions.
The line is here! It extends endlessly in both directions and has no beginning or conclusion.
Given a line segment SU in between a point T
Now,
SU = ST + TU
5x = 4x - 3 + 2x
5x = 6x - 3
6x - 5x = 3
x = 3
Now,
TU = 2x = 2(3) = 6 units.
Hence "The numeric length of TU for the given line segment will be 3 units".
For more about line segment,
https://brainly.com/question/25727583
#SPJ2
An accident investigator measured the skid marks of one of the vehicles involved in an accident. The length of the skid marks, d, was 117ft. Use the formula s=24d−−−√ to find s, the speed of the vehicle before the brakes were applied. Round your answer to the nearest tenth.
Answer:
The speed is 2808 ft/sStep-by-step explanation:
step one:
In this problem we are expected to substitute the value of d in the expression for velocity given as
[tex]s=24d[/tex]
step two:
Given that
d= 117 ft
Substituting the value for d in the given equation we have
[tex]s= 24*117\\\\s=2808 ft/s[/tex]
The problem basically tests our ability to perform basic substitution operation which we have performed, should you have any question or doubt, kindly respond to this question
Answer:
53
Step-by-step explanation:
Jan is constructing an inscribed regular hexagon for the circle shown. Point A will be one vertex of the hexagon. What step should be completed next?
Answer:
D) set the width of the compass to equal AP
Step-by-step explanation:
Regular hexagon has a property that its side is equal to radius. The step which should be taken is to set the length of compass equal to radius which is the distance AP.Correct answer option is D)
Answer options:
A) draw a ray from point P through A B) construct a diameter of the circle C) place a second point on the circle D) set the width of the compass to equal APplease help me /:
Given the table of values below, which of the following ordered pairs are
found on the graph of the inverse function?
Answer:
see below
Step-by-step explanation:
The ordered pairs of the inverse function are the reverse of the ordered pairs of the function.
You are given the function has ordered pairs (-3, -2), (3, -1) and so on. The inverse function will have ordered pairs (-2, -3), (-1, 3), and so on. This matches choice A.
13. – 5x – 10 = 2-2(x – 4)
Answer:
[tex] \boxed{ \boxed{ \bold{ \purple{ - 6.67}}}}[/tex]Step-by-step explanation:
[tex] \sf{ - 5x - 10 = 2 - 2(x - 4)}[/tex]
Distribute 2 through the parentheses
⇒[tex] \sf{ - 5x - 10 = 2 - 2x + 8}[/tex]
Move constant to right hand side and change it's sign
Similarly , Move variable to left hand side and change it's sign
⇒[tex] \sf{ - 5x + 2x = 2 + 8 + 10}[/tex]
Collect like terms
⇒[tex] \sf{ - 3x = 2 + 8 + 10}[/tex]
Add the numbers
⇒[tex] \sf{ - 3x = 20}[/tex]
Divide both sides of the equation by -3
⇒[tex] \sf{ \frac{ - 3x}{ - 3} = \frac{20}{ - 3} }[/tex]
Calculate
⇒[tex] \sf{x = - 6.67}[/tex]
Hope I helped !
best regards!!
h E l P HELP
(you don’t gotta show your work by the way)
Answer/Step-by-step explanation:
1. Converting 16 in to cm:
1 in = 2.54 cm
16 in = 16*2.54 = 40.64 cm
2. Converting 345lbs to kg:
1 lbs = 0.4536 kg
345 lbs = 345*0.4536 = 156.492 ≈ 156.49 kg(nearest hundredth)
3. Converting 56 g to oz:
1 g = 0.0353 oz
56 g = 56*0.0353 = 1.9768 ≈ 1.98 oz (nearest hundredth)
4. Converting 450 km to mi:
1 km = 0.6214 mi
450 km = 450*0.6214 = 279.63 mi
5. Converting 1200 ml to fl oz
1 ml = 0.0338 fl oz
1200 ml = 1200*0.0338 = 40.56 fl oz
6. Converting 40 m to ft:
1 m = 3.2808 ft
40 m = 40*3.2808 = 131.23 ft (nearest hundredth)
7. Converting 4 gal to l:
1 gal = 3.785 l
4 gal = 4*3.785 = 15.14 l
8. Converting 12 fl oz to ml:
1 fl oz = 29.575 ml
12 fl oz = 12*29.575 = 354.9 ml
9. Converting 50kg to lbs:
1 kg = 2.2046 lbs
50kg = 50*2.2046 = 110.23 lbs
For a confidence level of 85%, find the critical value for a normally distributed variable. The sample mean is normally distributed if the population standard deviation is known.
Answer:
The value is [tex]Z_{\alpha } = 1.439[/tex]
Step-by-step explanation:
From the question we are told that
The confidence level is C = 85%
Generally the level of significance is mathematically represented as
[tex]\alpha = (100 - 85 )\%[/tex]
[tex]\alpha = 0.15[/tex]
Now from the normal distribution table the critical value of [tex]\alpha[/tex] is
[tex]Z_{\alpha } = 1.439[/tex]
if you have 400 starting in the bank you deposit 250. withdraw 500 withdraw 100
Answer:
Hey there!
You have 50 dollars left.
400+250-500-100=50
Let me know if this helps :)
7^1 in expanded form
Step-by-step explanation:
[tex] {7}^{1} = 7 \times 1 \\ = 7[/tex]
Suppose coffee is initially brewed at 205 F and the room temperature is 70 F. Determine the value of kk if the temperature of the coffee drops from 205 F to 200 F in the first two minutes after brewing. Round answer to 4 decimal places.
Answer:
0.0189
Step-by-step explanation:
We solve for this using Newton's Law of cooling.
The formula for Newton's Law of cooling =
T −Ts = (To−Ts)e^-kt
T = Temperature after cooling
To = Initial temperature
Ts = Room temperature
k = constant
t = time = 2 mins
(200 - 70) = (205 - 70)e^-2k
130 = 135e^-2t
e^-2k= 130/135
k = In(130/135)/-2
k = 0.018870164
Approximately to 4 decimal places = 0.0189
Therefore, the value of k = 0.0189