Please help I’m being timed!!! A country commits to decreasing spending for infrastructure in various ways at a rate of 30% per
year. At the time of the announcement, the country is spending $12 billion per year. Which graph models the amount of infrastructure spending for future years?
1 answer:
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Answer:
The value of an appropriate test statistic for the car dealer to use is -4.
Step-by-step explanation:
The null hypothesis is:
The alternate hypotesis is:
The test statistic is:
In which X is the sample mean, is the value tested at the null hypothesis,
is the standard deviation and n is the size of the sample.
In this problem:
Then
The value of an appropriate test statistic for the car dealer to use is -4.
The quadratic function in vertex form is .
Solution:
The equation of a quadratic in vertex form is .
where (h, k) are the coordinates of the vertex and "a" is a multiplier.
Here (h, k) = (5, –2)
Substitute this in the vertex form.
– – – – (1)
Passes through the point (7, 0).
Here x = 7 and y = 0.
Substitute this in equation (1), we get
Add 2 on both sides.
2 = 4a
Divide 2 on both sides, we get
Substitute the value of a in equation (1),
The quadratic function in vertex form is .