Put it in the form

ax^2 + bx + c = 0

use the quadratic formula

x = [ -b + sqrt( b^2 - 4 ac ) ] / 2a

x = [ -b - sqrt( b^2 - 4 ac ) ] / 2a

7v^2 - 7v - 22 = 0

a = 7
b = -7
c = -22

v = [ 7 + sqrt ( 49 - 4 * 7 ( -22) ] / 2 * 7 = 2.34

v = [ 7 - sqrt ( 49 - 4 * 7 ( -22) ] / 2 * 7 = -1.34

7 0

3 years ago

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Question 18 Item 18 The distribution of the number of moths captured per night by a certain moth trap is approximately normal wi

juin [17]

Answer:

Standard deviation 46.3

Step-by-step explanation:

A 28% of the distribution is equivalent to a z score of -0.5828, you can use a z table to find that.

Z score is calculated as follows:

$z = \frac{x-\mu}{\sigma}$

x is the number being evaluated

μ is the mean

σ is the standard deviation

And it is used to calculate how many standard deviations you are from the mean of the sample.

Replacing with the known information you can calculate the standard deviation:

$\sigma=\frac{x-\mu}{z} =\frac{76-103}{-0.5828}= 46.3$

4 0

3 years ago

The equation of the graphed line is x+2y=5. What is the x-intercept of the graph?

IrinaVladis [17]

Answer:the x intercept is 5

Step-by-step explanation:

8 0

3 years ago

What is the distance between 4, 6 and 3,2

Ierofanga [76]

Answer:

Distance = 4.1231

Step-by-step explanation:

D = √((x2 - x1)^2 + (y2 - y1)^2

D = √((3 - 4)^2 + (2 - 6)^2)

D = √((-1)^2 + (-4)^2

D = √1+16

D = √17

D = 4.1231

3 0

2 years ago