Suppose the half-life of a certain radioactive substance is 12 days. Find the time when there will be 20% of the initial substance remaining. Assume you have 1 gram of the original substance.


pls help, it due today

Answer:

18.939

Step-by-step explanation:

Use SOH CAH TOA to find sin(23) = 7.4/x. Convert it to x(sin23) = 7.4. Divide both sides by sin23 to get x=18.939

Hey there!

[tex]\overline{AB} = 7.4m[/tex]

[tex]\overline{ACB} = 23°[/tex]

[tex] Sin(ACB) = \frac{\overline{AB}}{\overline{AC}}[/tex]

[tex] Sin(23°) = \frac{7.4}{\overline{AC}}[/tex]

[tex]\overline{AC}=18.939m[/tex]

Answer:

58 tourists

Step-by-step explanation:

25% = .25

.25 x 232

=58

Answer:

maximum amount of number of days that Jackson can rent a car while staying with his budget is 2 days

Step-by-step explanation:

first of all find the amount of money he will spend for 500 miles

in this case we multiply 0.12 by 500

=> 0.12 × 500

=> 60

subtract 60 from the money budgeted which is $210

=> $210 - 60

=> 150

divide 150 by the company charges per day which is dollars 68.64

=> 150 ÷ 68.64

divide 150 by 68.64

=> 2.185314685314685

approximately

=> 2 days

Answer:

2

Step-by-step explanation:

The modifications did Kepler make to Copernicus’s model are planetary orbits are elliptical (A) and Earth’s rotation causes the rising and setting of the sun (E).

There are three laws, made by the Kepler, to explain the motion of the planet around the sun.

Earth’s rotation causes the rising and setting of the sun because of the earth's rotation on its axis.

Hence, the modifications did Kepler make to Copernicus’s model are planetary orbits are elliptical (A) and Earth’s rotation causes the rising and setting of the sun (E).

Learn more about the laws of Kepler here;

https://brainly.com/question/15691974

Answer:

-4/5

Step-by-step explanation:

I calculated it and the answer came directly

Answer:

[tex] -\dfrac{4}{5} [/tex]

Step-by-step explanation:

[tex] -\dfrac{1}{10} \div \dfrac{1}{8} =  [/tex]

[tex] = -\dfrac{1}{10} \times \dfrac{8}{1} [/tex]

[tex] = -\dfrac{1 \times 8}{10 \times 1} [/tex]

[tex] = -\dfrac{8}{10} [/tex]

[tex] = -\dfrac{4}{5} [/tex]

Answer: 12

Step-by-step explanation:

Answer:

-43.5

Step-by-step explanation:

After 15 second he would have swam to a level of -43.5.

Answer:

5(2+x^5)

Step-by-step explanation:

...

im guessing we need to factor

Answer:

g(x) = 2f(x)

Step-by-step explanation:

Answer:

Step-by-step explanation:

Divide 5 by 3

5 divided by 3 is 1 (in the set of integers). The remainder is 2.

5/3 is 1.666666666666666666666666666666666666666666666666666666666666667 (in the set of reals).

Solution for 5 divided by 3

✍️See below how to solve this division manually.

5 divided by 3 - Long Division Solution

The solution below uses the "Long Division With Remainders Method". It is one of two existing methods of doing long division.

Start by setting the divisor 3 on the left side and the dividend 5 on the right:

 1 ⇐ Quotient

 ―

3)5 ⇐ Dividend

 3

 -

 2 ⇐ Remainder

The result of the division of 5 divided by 3 is 1.6666666666666667, as a decimal number.

5/3 as a mixed number

5 divided by 3 equals to the mixed number 1 2

3

.

Note that the result of the division 5÷3 is not an exact value and is equivalent to a recurring decimal 1.66... (which has 6 as the period).

Answer:

A

Step-by-step explanation:

[tex]\sqrt{50}[/tex] is not a perfect square. This means that you can rule out answers B and D, because it won't be 'exactly' anything.

Let's think about the other answer choices. C says that the answer of \sqrt{50} will be between 24 and 25. This is easily checkable by doing [tex]24^{2}[/tex], which equals 576. This easily eliminates option C.

Now, if the other answer choices weren't so obviously incorrect, let's see how you would solve this. What's the closest perfect square root under 50?

[tex]\sqrt{49}[/tex], which equals 7.

What's the closest perfect square root above 50?

[tex]\sqrt{64}[/tex], which equals 8.

This puts [tex]\sqrt{50}[/tex] between 7 and 8.

Answer:

Option A

Step-by-step explanation:

Here we can find out the correct option by eliminating the wrong options . We know that √50 is not a perfect square.

This eliminates option d as it says that its value is exactly 7 .

[tex]\implies \red{\text{ Option D is wrong }}[/tex]

Now look at Option C , it says that it lies between 24 and 25 . This is impossible since , 24² = 576 and 25² = 625 .

[tex]\implies \red{\text{ Option C is wrong }}[/tex]

Again the option b is similar to option d , as it says its exact value is 25 which is not possible. Hence this option is also wrong .

[tex]\implies \red{\text{ Option B is wrong }}[/tex]

Now we are ultimately left with option with shared that its value lies between 7 and 8 . We know that 7² = 49 and 8² = 64. And 50 lies in between them. Therefore Option A is the correct option .

[tex]\implies \green{\text{ Option A is correct. }}[/tex]

Answer: x=-8

Step-by-step explanation:

Answer:

the point where the two lines intersect is (-8, 4)

well, the volume of that triangular prism will just be the area of the triangle times the length.

now, what's the area of that triangular face?  well, let's say it has a base of "b" and a height of 3, whilst the prism has a length of 6, Check the picture below.

[tex]\stackrel{\textit{triangle's area}}{\cfrac{1}{2}(b)(3)}\stackrel{\textit{prism's length}}{(6)}~~ = ~~4\frac{1}{2}\implies 9b=\cfrac{9}{2}\implies b=\cfrac{9}{18}\implies b=\cfrac{1}{2}[/tex]

Answer: X is less than or equal to 240

The solution to the inequality 0.75x - 100 ≤ 80 is x ≤ 240.

Given is an inequality what is 0.75x – 100 ≤ 80, we need to solve it,

To solve the inequality 0.75x - 100 ≤ 80, we can follow these steps:

1. First, let's isolate the variable x by adding 100 to both sides of the inequality:

0.75x - 100 + 100 ≤ 80 + 100

0.75x ≤ 180

2. Next, we can divide both sides of the inequality by 0.75 to solve for x:

(0.75x) / 0.75 ≤ 180 / 0.75

x ≤ 240

Therefore, any value of x that is less than or equal to 240 will satisfy the inequality.

Therefore, the solution to the inequality 0.75x - 100 ≤ 80 is x ≤ 240.

Learn more about Inequality click;

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#SPJ6

Answer:

This property is associative

Step-by-step explanation:

Answer:

distributive property of multiplication over addition

Step-by-step explanation:

The distributive property of multiplication over addition:

a(b + c) = ab + ac

(9 + 6)4 = 9 × 4 + 6 × 4

is an example of the distributive property.

Answer:

B

Step-by-step explanation:

Hope this helps!!!

Answer:

B. Math , Social Studies , Reading is the answer.

I think this helps you ☺️☺️.

Thank you ☺️☺️☺️

Answer:

m = 8

Step-by-step explanation:

first set the inside values equal to 90 degrees (6m + 6) + 36 = 90.

then easily work it out.

subtract 36 from each side

(6m + 6) + 36 = 90

               -36     -36

so now it's (6m + 6) = 54

subtract 6 from each side

6m = 48

divide each side by 6

m = 8

Answer:

11

Step-by-step explanation:

Answer:

11 hours

Step-by-step explanation:

22÷4 = 5.5

5.5×2 = 11

Answer:

yes its right

Step-by-step explanation:

Answer:

J: (2, 4)

K: (1, 1)

L: (4, 0)

M: (1, 3)

N: (3, 2)

O: (2, -2)

P: (-1, 0)

Im not sure what the J' or K' means, i might have to search it up but ill try answering that too

Step-by-step explanation:

this is very simple actually! i can teach you:

(x,y)

so if you are counting left or right it goes to the x. for example, if you want to find J, you go to the black dot that says J and count starting from 0 or by looking at the x axis.

if you are counting up or down you go to (input the value) the y. if you want to find J for example, (the y coordinate) you go to the black dot and you count starting from 0. usually it will have the points -5 -4 -3 -2 -1 0 1 2 3 4 5 but in your problem it does not have so you just have to count carefully.

i will go search for what K' or J' means

Answer:

the slope should be -1/3 because perpendicular is always opposite of the original slope.

Step-by-step explanation:

Answer:

A. First graph

Step-by-step explanation:

2x - y = 8 in slope intercept form is y = 2x - 8

x - y = 2 in slope intercept form is y = x - 2

The first graph matches the slope intercept form equations.

Answer:

x = 25

Step-by-step explanation:

[tex]2x + 10 + 30 = 90[/tex]

[tex]2x + 40 = 90[/tex]

[tex]2x = 50[/tex]

[tex]x = 25[/tex]

Answer:

[tex]\displaystyle 34°[/tex]

Step-by-step explanation:

[tex]\displaystyle csc^{-1}\:1\frac{4}{5} = \theta; 33,748988596...° \\ \\ \boxed{34° \approx \theta}[/tex]

OR

[tex]\displaystyle sin^{-1}\:\frac{5}{9} = \theta; 33,748988596...° \\ \\ \boxed{34° \approx \theta}[/tex]

I am joyous to assist you at any time.

Answer:

[tex]\displaystyle 76\:cm.[/tex]

Step-by-step explanation:

[tex]\displaystyle 2l + 2w = P \\ \\ \boxed{76} = 36 + 40 \Rightarrow 76 = 2[18] + 2[20] \\ \\ \boxed{76 = P} [/tex]

I am joyous to assist you at any time.

Perimeter:-

[tex]\\ \rm\rightarrowtail 2(L+B)[/tex]

[tex]\\ \rm\rightarrowtail 2(20+18)[/tex]

[tex]\\ \rm\rightarrowtail 2(38)[/tex]

[tex]\\ \rm\rightarrowtail 76cm[/tex]

Answer:

y= (2)(5)+12

 =10+12

 = 22

Answer:

22

Step-by-step explanation:

replace the variables with the given values:

y=(2)(5)+12

y=10+12

y=22

Answer:

2x+2=3x-10

2+10=3x-2x

x= 12

Answer:

x = 12

Step-by-step explanation:

The diagonals PN and MO are perpendicular bisectors of each other, thus

QO = MQ , substitute values

3x - 10 = 2x + 2 ( subtract 2x from both sides )

x - 10 = 2 ( add 10 to both sides )

x = 12