The vertex of this parabola is at (-2,-3).when the y value is -2 the x value is -5 what is the coefficient of the squared term in the parabola equation

Y=a (x-h) ^ + k
so your parabola has an equation of:
y=a(x+2)^ -3

-2=a(5+2) ^ -3
-2=a(-3)^-3
-2=9a-3

adding them to both sides
1=9a

divide both sides:
1=9a

Divide both sides by 9:
a=1/9

the vertex form is:
y=(1/9)(x+2)^-3

The expanded form is:
y=(1/9)x^ + (4/9)x - (23/9)

Anw: E. (1/9)

-3

Step-by-step explanation:

Just took the test on APEX and got it correct

a. If the P-value is smaller than the significance level, the null hypothesis is rejected.

b. Pooled proportion = 0.8

c. z = 2.7

d. As the P-value (0.0072) is smaller than the significance level (0.05), the null hypothesis is rejected.

There is enough evidence to support the claim that the proportions differ significantly.

Step-by-step explanation:

This is a hypothesis test for the difference between proportions.

We will use the P-value approach, so the decision rule is that if the P-value is lower than the significance level, the null hypothesis is rejected.

The claim is that the proportions differ significantly.

Then, the null and alternative hypothesis are:

The significance level is 0.05.

The sample 1, of size n1=200 has a proportion of p1=0.85.

The sample 2, of size n2=150 has a proportion of p2=0.7333.

The difference between proportions is (p1-p2)=0.1167.

The pooled proportion, needed to calculate the standard error, is:

The estimated standard error of the difference between means is computed using the formula:

Then, we can calculate the z-statistic as:

This test is a two-tailed test, so the P-value for this test is calculated as (using a z-table):

As the P-value (0.0072) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the proportions differ significantly.