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2 years ago

What is an equation of the axis of symmetry for the parabola whose equation is y=2x^2 + 8x-1

Mathematics

1 answer:

docker41 [41]2 years ago

3 0

Answer:

x = - 2

Step-by-step explanation:

The equation of the axis of symmetry is a vertical line with equation

x = c

where c is the value of the x- coordinate of the vertex

The x- coordinate of the vertex is

x = - $\frac{b}{2a}$

Given

y = 2x² + 8x - 1

with a = 2 and b = 8 , then

x = - $\frac{8}{4}$ = - 2

x = - 2 is the equation of the axis of symmetry

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If you have a 25 question test and you made a 64 on it, then how many questions did you get right and how many did you get wrong

S_A_V [24]

Answer:

9 questions wrong 16 questions right

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

x P(x) 0 0.25 1 0.3 2 0.1 3 0.35 Find the standard deviation of this probability distribution. Give your answer to at least 2 de

barxatty [35]

Answer:

The standard deviation of this probability distribution is 1.2.

Step-by-step explanation:

We have that:

P(X = 0) = 0.25

P(X = 1) = 0.3

P(X = 2) = 0.1

P(X = 3) = 0.35

Mean:

Each value multiplied by its probability. So

$M = 0*0.25 + 1*0.3 + 2*0.1 + 3*0.35 = 1.55$

Variance:

Sum of the squares of the values subtracted from the mean, and multiplied by its probability.

$V = 0.25*(0-1.55)^2 + 0.3*(1-1.55)^2 + 0.1*(2-1.55)^2 + 0.35*(3-1.55)^2 = 1.4475$

Standard deviation:

Square root of the variance. So

$S = \sqrt{V} = \sqrt{1.4475} = 1.2$

The standard deviation of this probability distribution is 1.2.

6 0

3 years ago

<img src="https://tex.z-dn.net/?f=2%20%2B%202%282%20%2B%202%20%20%5Ctimes%200%292%20%2B%200%20%3D" id="TexFormula1" title="2 + 2

Vaselesa [24]

---------------------
2+2(2+2*0)2+0
2+2×(2+0)×2+0
2+2×2×2+0
2+8+0
10
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8 0

3 years ago

Bus stop Restaurant sell 3/4 as many cheeseburgers as they do with hamburgers on any given day. If there are a total of 42 burge

schepotkina [342]

Answer:

24cb 18 hb

Step-by-step explanation:

Let's call C the number of cheese burger sold and H the number of hamburgers.

As the cheeseburger sold are 3/4 of hamburgers, we can represent with the following equation:

C= (3/4)H (equation 1)

The total of burgers sold are the total of cheeseburger plus the total of hamburgers, and the sum 42. The equation representing it is:

C + H = 42

Replacing C by its value of eq. 1:

(3/4)H + H = 42

(3/4)H + (4/4)H = 42

(7/4) H = 42

Dividing both sides by (7/4)

H = 42/(7/4)

H= 42*(4/7)

H= (42/7)*4

H= 6*4

H=24

Then, C is:

C=(3/4)H

C=(3/4)*24

C= 3*24/4

C=72/4

C=18

We can verify it summing C+H

C+H=24+18=42 verified!

6 0

3 years ago

Can someone explain this to me not only answers make sure to make it clean then i will mark brainliest please i really need an e

Igoryamba

Answer:

Since the sum of the angles equal to 720, you have to add all the angles to add to 720 and then solve for x, in which would look like this (x+2)+(x-4)+(x+6)+(x-3)+(x+7)+(x-8)=720, which is simplified to (6x)=720, in which will make x=120. Next, since its angle E, you plug in tha x value, (120+6), in which the ANSWER IS 126 DEGREES

Step-by-step explanation:

Hope this help ^w^

4 0

3 years ago