Answer:
Planes and pulleys can increase the speed of completed work
Step-by-step explanation:
The factors of 4x^2 +8x-5 are (2x-1) and (2x+5)
Step-by-step explanation:
-10 or -20 satisfies the equation.
But when you substitute 10 in:
30-40<-50+8
-10<-42(wrong)
it's wrong
Answer:
The test statistic for this test is 3.82.
Step-by-step explanation:
The null hypothesis is:
The alternate hypotesis is:
Our test statistic is:
In which X is the sample mean,
is the value tested at the null hypothesis,
is the standard deviation of the population and n is the size of the sample.
In this question:
![X = 8745, \mu = 8500, \sigma = 1200, n = 350](https://tex.z-dn.net/?f=X%20%3D%208745%2C%20%5Cmu%20%3D%208500%2C%20%5Csigma%20%3D%201200%2C%20n%20%3D%20350)
So
The test statistic for this test is 3.82.