Which statement is true about the end behavior of the function represented by the graph?
As x approaches 1, f(x) approaches 25.
As x approaches −∞, f(x) approaches −∞, and as x approaches ∞, f(x) approaches −∞.
As x approaches −∞, f(x) approaches −4, and as x approaches ∞, f(x) approaches 7.
As x approaches −∞, f(x) approaches −∞, and as x approaches ∞, f(x) approaches ∞.
Answers
End behavior always involves x approaching positive and negative infinity. So we'll cross off the choice that says "x approaches 1".
The graphs shows both endpoints going down forever. So both endpoints are going to negative infinity regardless if x goes to either infinity.
Answer: Choice BAs x approaches −∞, f(x) approaches −∞, and as x approaches ∞, f(x) approaches −∞.Another way to phrase this would be to say "f(x) approaches negative infinity when x goes to either positive or negative infinity"
End behavior always involves x approaching positive and negative infinity. So we'll cross off the choice that says "x approaches 1".
The graphs shows both endpoints going down forever. So both endpoints are going to negative infinity regardless if x goes to either infinity. (Option B)
What is end behavior in graphs?End behavior refers to the behavior of a graph as the x-values approach positive or negative infinity.
It describes how the graph behaves at the far left and far right ends.
End behavior can be categorized as increasing or decreasing, and it helps understand the long-term trend or direction of the graph.
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Related Questions
The price of bananas can be determined by the equation p=0.45n where p is the price and n is the number of bananas. What is the constant of proportionality (unit rate)
Answers
Answer:
The constant of proportionality is 0.45.
Step-by-step explanation:
The constant of proportionality is the ration of two different quantities or is the unit value of a quantity.
The expression representing the price of bananas is:
[tex]p=0.45n[/tex]
To determine the unit rate of bananas divide the price by the number of bananas.
[tex]\text{Unit Rate}=\frac{p}{n}[/tex]
[tex]=\frac{0.45n}{n}\\\\=0.45[/tex]
Thus, the constant of proportionality is 0.45.
Which equation matches the graph of the absolute value function seen here?
A) y = -|x|
B) y = -
1
2
|x| - 1
C) y =
1
2
|x - 3| - 1
D) y = |
1
2
x - 2| - 1
Answers
Answer:
Step-by-step explanation:
Which figure is described below?
The locus of points 6 units from the
point (1, -2) on the coordinate plane.
Answers
Answer:
C; Circle
Step-by-step explanation:
In this question, we are interested in giving a term to the locus of points which are at a certain distance from a fixed point.
The correct answer to this is a circle.
From the question, we can picture a situation which we have the point (1,2) as the center of the circle. This point serve the starting point in which all other points which are exactly 6 units away are plotted.
Thus, from this center point, we can mark off several points around the center point. By tracing the marked points from these center, we can obtain a circular path which when traced completely will give us the identity of a circle, where these points represent the line bounding the circle which is referred to the circumference of the particular circle in question.
Further more, from the definition of the radius of a circle, it is the distance from the center of a circle to the circumference. While the point (1,2) represents the center of the circle in question, the distance 6 units stand for the radius of the circle.
Answer:
circle
Step-by-step explanation:
I need help determining the rang of this graph
Answers
The highest point is when y = 0 and the lowest point is when y = -5
We can see this if we draw horizontal lines through the highest and lowest points (see the diagram below). Note where the horizontal lines cross the y axis. For y = 0, we don't really need a horizontal line but I'll draw it anyway.
Since y ranges from y = -5 to y =0, the range is therefore [tex]-5 \le y \le 0[/tex]
Answer: y is a real number such that [tex]-5 \le y \le 0[/tex]Side note: to write this in interval notation, you would say [tex][-5, 0][/tex]. The square brackets say to include each endpoint as part of the range.
An irrational number is considered irrational if it meets one of two rules. What are the two rules?
Answers
Answer:
Step-by-step explanation:
A number that cannot be exactly expressed as a ratio of two integers.
An irrational number cannot be written as a simple fraction.
Pi is a famous irrational number.
Can you help me with this please this is my first time using the app
Answers
Answer:
A
Step-by-step explanation:
squared 3x times squared 49x
Answers
Answer:
9xx2401x=21609x
Step-by-step explanation: 3x3=9. 40x40=1600, 40x9=360x2 because there are 2 of the same problem because the number is the same. 9x9=81.
Now we add them up. 1600+720+81=2401. 2401x9=21609
But don't forget to add the x at the end or the answer is wrong!!!
URGENT!!!!!!! Find all seventh roots of unity and sketch them on the axes below.
Answers
Answer:
The 7th roots are : [tex]$ 1, \frac{2 \pi}{7}, \frac{4 \pi}{7}, \frac{6 \pi}{7}, \frac{8 \pi}{7}, \frac{10 \pi}{7}, \frac{12 \pi}{7}$[/tex]
Step-by-step explanation:
The roots of unity are evenly spread around the unit circle.
The roots of unity can be find by using the relation
[tex]$ 1= 1 ( \cos 0 ^\circ +i \sin ^\circ )$[/tex]
[tex]$\sqrt[n]{1} = 1 [\cos (\frac{2k \pi}{n}})+ i \sin (\frac{2k \pi}{n}) ] $[/tex]
Now z be a polynomial.
[tex]$z^7=1 \Rightarrow z = 1^{\frac{1}{7}}$[/tex]
therefore, cos 0 = 1.
[tex]$ z = \cos (2k \pi)^{\frac{1}{7}}$[/tex] [tex]$ (\cos \theta)^n = \cos n \theta $[/tex]
[tex]$ z = \cos \frac{2k \pi}{7} $[/tex]
Now, for k=0, z = 1
[tex]$ k=1 \Rightarrow z = \cos \frac{2 \pi}{7} = \cos 3 \frac{2 \pi}{7}+ i \sin \frac{2 \pi}{7}$[/tex]
[tex]$ k=2 \Rightarrow z = \cos \frac{4 \pi}{7} = \cos \frac{4 \pi}{7}+ i \sin \frac{4 \pi}{7}$[/tex]
[tex]$ k=3 \Rightarrow z = \cos \frac{6 \pi}{7} = \cos \frac{6 \pi}{7}+ i \sin \frac{6 \pi}{7}$[/tex]
[tex]$ k=4 \Rightarrow z = \cos \frac{8 \pi}{7} = \cos \frac{8 \pi}{7}+ i \sin \frac{8 \pi}{7}$[/tex]
[tex]$ k=5 \Rightarrow z = \cos \frac{10 \pi}{7} = \cos \frac{10 \pi}{7}+ i \sin \frac{10 \pi}{7}$[/tex]
[tex]$ k=6 \Rightarrow z = \cos \frac{12 \pi}{7} = \cos \frac{12 \pi}{7}+ i \sin \frac{12 \pi}{7}$[/tex]
[tex]$ k=7 \Rightarrow z = \cos \frac{14 \pi}{7} = \cos \frac{14 \pi}{7}+ i \sin \frac{14 \pi}{7}$[/tex]
Then the 7th roots are : [tex]$ 1, \frac{2 \pi}{7}, \frac{4 \pi}{7}, \frac{6 \pi}{7}, \frac{8 \pi}{7}, \frac{10 \pi}{7}, \frac{12 \pi}{7}$[/tex]
Determine whether the fractions 3/6 and 4/8 are equivalent.
Answers
Answer:
they are equivalent
Step-by-step explanation:
[tex]\frac{3}{6} = \frac{1}{2} (both \: can \: be \: divide \: by \: 3)[/tex]
[tex] \frac{4}{8} = \frac{1}{2} (both \: can \: be \: divide \: by \: 4)[/tex]
The two (2) fractions are equivalent.
In this exercise, you're required to determine whether or not given fractions are equivalent (equal). In order to do this, we would reduce the fractions to the lowest term.
Given the following fractions;
Fraction A = [tex]\frac{3}{6}[/tex]Fraction B = [tex]\frac{4}{8}[/tex]For Fraction A, we would divide both the numerator and the denominator by 3 because it's common to both them.
Fraction A = [tex]\frac{3}{6} = \frac{1}{2}[/tex]
Simplifying Fraction B, we have;
Fraction B = [tex]\frac{4}{8} = \frac{1}{2}[/tex]
Also, for two (2) fractions to be equivalent, their sums must be equal to one (1).
[tex]Fraction \;A + Fraction \;B = 1[/tex]
[tex]\frac{1}{2} + \frac{1}{2} = 1[/tex]
Therefore, we can deduce from the calculations that the two (2) fractions are equivalent.
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help me yall this for me aint it.
Answers
Answer:
20(4 + 5)
Step-by-step explanation:
GCF is just the biggest number each value can be divided by. Here, it's 20, so that goes outside of the parenthesis. Now, what can you multiply by 20 to get 80? 4, so that goes in the second box. What can you multiply by 20 to get 100? 5, so that goes in the last box. You can check your answer by doing 80 + 100 = 180; 20(9) = 180.
So you have to find the GCF (Greatest Common Factor) or 80 and 100, which is 20.
20(?+?)
20 times what gets you 80?
20 times 4 gets you 80.
20 times what gets you 100?
20 times 5 gets you 100.
20(4+5) = 80+100 = 180
♡ Hope this helped! ♡
❀ 0ranges ❀
Find an equation of a line that goes through (4,1) and is perpendicular to the line x - 3y = 9. DO NOT USE THE POINT SLOPE METHOD, use the Slope Intercept method demonstrated.
Answers
Answer:
y = -3x + 13
Step-by-step explanation:
For slope-intercept form, you need the slope and the y-intercept. To find the slope, you need to rearrange the given equation to slope-intercept form.
x - 3y = 9
-3y = -x + 9
y = 1/3x - 3
The slope for the given equation is 1/3. The slope of a perpendicular line will be the negative reciprocal. This means that the slope of the perpendicular line will be -3.
You can now solve for the y-intercept (b) using the slope (m) and the given point in slope-intercept form.
y = mx + b
1 = (-3)(4) + b
1 = -12 + b
13 = b
b = 13
Now that you have both the slope and y-intercept, you can find the equation.
y = -3x + 13
The equation of the line is y = -3x + 13
What is an equation of a line?The equation of a line is an algebraic form of representing the set of points, which together form a line in a coordinate system.
The slope intercept form is given by:
y = mx + b
m = slope and b = y-intercept
We have,
A line perpendicular to line x - 3y = 9 and the line passes through the point (4, 1).
Make the line x - 3y = 9 in slope-intercept form.
-3y = 9 - x
y = (9 - x) / -3
y = (1/3)x - 3
The slope of the line x - 3y = 9 is:
m1= 1/3
Since the line required to find is perpendicular to the line x - 3y = 9
Let the required line slope be m2
m1 x m2 = -1
m2 = -1 / (1/3) = -3
The required line passes through the point (4, 1).
Let the required line be y = mx + b
we have,
1 = (-3)4 + b
1 = -12 + b
b = 13
We can write as:
y = -3x + 13
Thus the equation of the line is y = -3x + 13
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Lin created a scaled copy of Triangle A with an area of 72 square units. How many times larger is the area of the scaled copy compared to that of Triangle A
Answers
Answer:
The question is not complete, here is a possible match to the complete question:
Here is Triangle A. Lin created a scaled copy of Triangle A with an area of 72 square units. What scale factor did Lin apply to the Triangle A to create the copy? Remember: A=1/2bh
a) 4
b) 8
c) 16
Answer:
Scale factor = 16
Step-by-step explanation:
From the diagram attached to this solution, the triangle was plotted on a graph sheet, and each grid on the graph represents 1 unit. hence the dimensions of Triangle A from the diagram is as follows:
Base = 3 units
Height = 3 units
Next, in order to determine the scale factor of the area of the triangle after scaling, let us calculate the area of the unscaled triangle.
Area of Triangle = 1/2 (base × height)
Area or Triangle = 0.5 × 3 × 3 = 4.5 square units
Therefore,
Area of unscaled triangle = 4.5 squared units
Area of scaled triangle = 72 squared units
since the area of the scaled triangle is larger than the unscaled triangle, the scale factor is simply the number of times by which the scaled triangle was enlarged, compared to the unscaled triangle. This can be calculated by dividing the scaled triangle by the unscaled triangle as follows:
Scale factor =(scaled triangle) ÷ (unscaled triangle)
Scale factor = 72 ÷ 4.5 = 16
Amira has a bag of cat food her cat eats 1/10 of a bag per week how many weeks will the food last ?.
Answers
Answer:
10 weeks
Step-by-step explanation:
A line passes through the point (4,-4) and has a slope of 5/4.
Write an equation in slope-intercept form for this line.
Answers
Answer:
y = 5/4x - 9
Step-by-step explanation:
y = mx + b
when you plot 4, -4 you have your first clue and point. then go up 5 and right 4 or down5 and left 4. When you go down you will reach the y intercept. On the number- 9. So -9 is your y intercept which goes in b.
Since 5/4 goes in the mx since it is slope the answer is y = 5/4 - 9
How many pennies could you have if:
When you break the pennies into groups of 2, you have
1 penny left over, AND when you break the pennies into
groups of 3, you have 1 penny left over, AND when you
break the pennies into groups of 5, you have 1 penny
left over, AND when you break the pennies into groups
of 7, you have NO pennies left over?
Answers
Answer:
The number of pennies are 91 pennies
Step-by-step explanation:
The given parameters are
When we split the pennies in twos the number left = 1
When the pennies are split in 3s the number left = 1
When the pennies are split in 5s the number left = 1
When the pennies are split in 7 the number left = 0
Therefore, 7 is a factor of the number
Given that when the pennies are split in 5s the number left = 1, the number ends with a 1
We have the products of 7 ending with 1 from Excel as 21 and 91, 161...
We check 91 given 21 is directly divisible by 3 as follows;
91/2 = 45 remainder 1
91/3 = 30 remainder 1
91/5 = 18 remainder 1
91/7 = 13 remainder 0
Therefore, the number of pennies are 91 pennies.
Aneesha travels at a rate of 50 miles per hour. Morris is traveling 3 feet per second less than Aneesha. Which is the best estimate of the speed Morris is traveling? algebra
Answers
Answer:
50 miles per hour =73.33 feet per second (the conversion rate)
now if Morris is travelling 3 feet per second less than Aneesha so, the speed of Morris is 70.33 feet per second;
if we convert this to Miles per hour;
70.33 feet per second= 48 miles per hour (approximately)
so here the last last option is the right
48 miles per hour
Answer:
48 miles per hour
Step-by-step explanation:
Write the given number in the form a × 10 n , where a is a real number such that 1 ≤ |a| < 10 and n is an integer. 230,000,000,000 = 2.3 × 100,000,000,000 = 2.3 × 10 11
Answers
Answer:
2.3 x 10^11.
Step-by-step explanation:
There are 11 digits after the first digit (2).
The answer is 2.3 x 10^11.
This is called scientific notation.
Find the value of x. A. 3 B. 2 C. 5 D. 6
Answers
Answer:
[tex]\Huge \boxed{x=5}[/tex]
Step-by-step explanation:
Apply the intersecting chord theorem.
DK × BK = AK × CK
12(4x+1) = 14(3 + 3x)
Expand brackets.
48x + 12 = 42 + 42x
Subtract 42x and 12 from both sides.
6x = 30
Divide both sides by 6.
x = 5
Answer:
C
Step-by-step explanation:
Given 2 chords intersecting inside a circle, then
the product of the measures of the parts of one chord is equal to the product of the measures of the parts of the other chord, that is
12(4x + 1) = 14(3 + 3x) ← distribute parenthesis on both sides
48x + 12 = 42 + 42x ( subtract 42x from both sides )
6x + 12 = 42 ( subtract12 from both sides )
6x = 30 ( divide both sides by 6 )
x = 5
Two sums of money are in the ratio 5:1.If the Smaller amount is 15 kobo.What is the largest?
(a) 35k (b) 45k (c)55k (d)65K (e) 75K
Answers
Answer:
[tex]\huge\boxed{ x = 75 k}[/tex]
Step-by-step explanation:
The given ratio is:
=> 5 : 1
Given that the smallest one is 15k
So, Let's built a proportion:
=> 5 : 1 = x : 15 [Where x is the unknown one]
Product of Means = Product of Extremes
x = 5 * 15
=> x = 75 k
Travis is deciding how to study math tonight. He is choosing between studying graphs (G) patterns (P) or equations (E). He is also deciding whether he should use a textbook (T) or videos (V) to study. He will choose one topic and one method of learning. Which combo is tight
A. GT,GV,PT,PV
B. GT PT ET GV PV EV
C GT GV PT PV ET EV TV
D GP GE GT GV PE PT PV ET EV TV
Answers
Answer:
The correct option is;
B. GT PT ET GV PV EV
Step-by-step explanation:
The given information we have;
The number mathematics topics Travis has to chose from tonight = 3 topics
The number of ways he can chose to study each topic = 2 ways
Therefore the number of different combo Travis can chose from is given as follows;
The number of combos = The number of topics × The number of ways
∴ The number of combos = 3 × 2 = 6 combos
Therefore, the possible combos are;
B. GT PT ET GV PV and EV which is the same as GT, GV, PT, PV, ET, and EV.
find the diameter of the circle whose circumference are 198cm
Answers
Answer:
63.057
Step-by-step explanation:
circumference= πd
Answer:
[tex] \boxed{ \boxed{ \bold{ \sf{63.05 cm}}}}[/tex]
Step-by-step explanation:
Given,
Circumference ( C ) = 198 cm
Diameter ( d ) = ?
Now, let's find the diameter of the circle :
We have,
[tex] \sf{c \: = \: \pi \: d}[/tex]
plug the values
⇒[tex] \sf{198 = 3.14 \: d}[/tex]
Swap the sides of the equation
⇒[tex] \sf{3.14 \: d \: = 198}[/tex]
Divide both sides of the equation by 3.14
⇒[tex] \sf{ \frac{3.14 \: d}{3.14} = \frac{198}{3.14} }[/tex]
Calculate
⇒[tex] \sf{d = 63.05}[/tex] cm
[tex] \underline{ \underline{ \sf{ \bold{ \blue{further \: more \: information}}}}}[/tex]
▪️[tex] \sf{ \bold{ Circumference}}[/tex]
⇒The perimeter of a circle is called it's circumference. It is the total length of the curved line of the circle.
▪️[tex] \sf{ \bold{ Radius}}[/tex]
⇒It is the line segment that joins the center of a circle and any point on its circumference.
▪️[tex] \sf{ \bold{Diameter}}[/tex]
⇒A line segment that passes through the centre of a circle and joins ant two points on its circumference is called the diameter of the circle. The length of a diameter is two times radius.
Hope I helped!
Best regards!!
find the range of the following functions.f(x)=2+5sin3x
Answers
Answer:
Range: [-3, 7]
Step-by-step explanation:
Range is all the y-values that are outputted.
When we graph the equation, we should see our minimum y-value and maximum y-value.
A collection of nickels, dimes and pennies has an average value of 7 cents per coin. If a nickel were replaced by five pennies, the average would drop to 6 cents per coin. What is the number of dimes in the collection?
Answers
Answer: The number of dimes is:
Dimes = -(Nickels + Pennies) + 24.
Such that Nickels + Pennies < 24, and each quantity refers to the initial number of coins of the given type.
Step-by-step explanation:
Let's call N = number of nickels, D = number of dimes, and P = number of pennies.
The total number of coins is N + D + P
We know that the total value in nickels is:
N*$0.05
The total value in dimes is:
D*$0.10
And the total value on Pennies is:
P*$0.01
Then, the "mean" value of the coins will be equal to the total value of all the coins, divided the total number of coins.
$0.07 = (N*$0.05 + D*$0.10 + P*$0.01)/(N + D + P)
we can mutiply at both sides by the total number of coins, and we have:
$0.07*(N + D + P) = N*$0.05 + D*$0.10 + P*$0.01
Now, if we remove one nickel by five penies, we have:
$0.06 = ((N-1)*$0.05 + D*$0.10 + (P+5)*$0.01)/(N - 1 + D + P + 5)
Again, we multiply in both sides by the total number of coins and:
$0.06*(N - 1 + D + P + 5) = ((N-1)*$0.05 + D*$0.10 + (P+5)*$0.01)
Ok, now we have two equations:
$0.07*(N + D + P) = N*$0.05 + D*$0.10 + P*$0.01
$0.06*(N + D + P + 4) = ((N-1)*$0.05 + D*$0.10 + (P+5)*$0.01)
We can take the second equation and write the right side as:
$0.06*(N + D + P + 4) = ((N-1)*$0.05 + D*$0.10 + (P+5)*$0.01)
= N*$0.05 + D*$0.10 + P*$0.01 - 1*$0.05 + 5*$0.01
= N*$0.05 + D*$0.10 + P*$0.01
Now, the two equations are:
$0.07*(N + D + P) = N*$0.05 + D*$0.10 + P*$0.01
$0.06*(N + D + P + 4) = N*$0.05 + D*$0.10 + P*$0.01
Then we have that:
$0.07*(N + D + P) = $0.06*(N + D + P + 4)
D*($0.07 - $0.06) = ($0.06 - $0.07)*(N + P)) + 4*$0.06
D*$0.01 = -$0.01(N + P) + 4*$0.06
D = (-$0.01(D + P) + 4*$0.06)/$0.01 = -(N + P) + 24
So the number of Dimes is related to the number of pennies and nickels that we have at the begginig.
Such that in both cases the number of dimes is equal:
D = -(N + P) + 24
Notice that N + P can not be larger or equal than 24, so we have the rule:
N + P < 24.
D
Evaluate y5 + x(-7)
When x = 2, y = -5
Answers
Answer:
45
Step-by-step explanation:
OK, first we turn the variables into into the actual values:
The equation will look like this:
(2)5 + (-5)(-7)
Now its easier to solve! Lets solve (2)5!
2 * 5 = 10
The equation looks like:
10 + (-5)(-7)
We will also solve (-5)(-7). Remember that a negative number times a negative number is positive!
-5 * -7 = 35
Lets finish the rest:
10 + 35 = 45.
Hope this is correct and have a nice day!
What’s the area of this shape?
Answers
Answer:
212 m²
Step-by-step explanation:
Break it down into 3 rectangles.
10x8=80
4x13=52
16x5=80
80+52+80=212
what is the expression of 2+32times5
Answers
Answer:
2+32×5
If you want the answer:
2+160
162
Step-by-step explanation:
Answer:
2+5^32
Step-by-step explanation:
A shed can hold up to 1620 cubic feet. Items totaling 1180 cubic feet are put
into the shed. If the variable v stands for the amount of additional volume the
shed can hold, which would be a reasonable value for ?
A.) 12 cubic feet
B.) 2800 cubic feet
C.) 0.4 cubic feet
D.) 400 cubic feet
Answers
Answer:
c is the answer
Step-by-step explanation:
Answer:
D. 400 cu ft/
Step-by-step explanation:
1620 - 1180
= 440.
I really need help with this, ill give brainliest if its right :)
Am I right to try and prove that ΔABC ≅ ΔGFE by ASA? it was given that ∠B ≅ ∠F and I proved that ∠ACB ≅ ∠GEF but i cant figure out which side to prove or how to prove it?
Answers
Answer:
maybe
Step-by-step explanation:
To use ASA, you need to show the side between the angles is congruent to the corresponding side. In ΔACB, you have shown that angles B and C are congruent to their counterparts. The side between angles B and C is BC.
To use ASA, you must show BC ≅ FE.
__
Not enough information is given here for us to tell how one might prove congruence of the triangles. Hence your approach may work, or it may not--depending on the given information.
A jar of peanut butter contains 454 g with a standard deviation of 10.2 g. Find the probability that a jar contains more than 466 g. Assume a normal distribution. Use a z-score rounded to 2 decimal places.
Answers
Answer:
The probability that a jar contains more than 466 g is 0.119.
Step-by-step explanation:
We are given that a jar of peanut butter contains a mean of 454 g with a standard deviation of 10.2 g.
Let X = Amount of peanut butter in a jar
The z-score probability distribution for the normal distribution is given by;
Z = [tex]\frac{X-\mu}{\sigma}[/tex] ~ N(0,1)
where, [tex]\mu[/tex] = population mean = 454 g
[tex]\sigma[/tex] = standard deviation = 10.2 g
So, X ~ Normal([tex]\mu=454 , \sigma^{2} = 10.2^{2}[/tex])
Now, the probability that a jar contains more than 466 g is given by = P(X > 466 g)
P(X > 466 g) = P( [tex]\frac{X-\mu}{\sigma}[/tex] > [tex]\frac{466-454}{10.2}[/tex] ) = P(Z > 1.18) = 1 - P(Z [tex]\leq[/tex] 1.18)
= 1 - 0.881 = 0.119
The above probability is calculated by looking at the value of x = 1.18 in the z table which has an area of 0.881.
a) x² - y² - x + y Factorize
Answers
Answer:
(x - y) (x+y -1)
Step-by-step explanation:
See steps of factorization:
x² - y² - x + y =(x² - y²) - (x - y) = (x - y) (x + y) - (x- y) =(x - y) (x+y -1)