Can someone my cousin? hes in 5th grade and im not sure if im right with this question. : )

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

Find the sum of the given arithmetic series. 24 + 17 + 10 + 3 + + (–39)

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95