Solve the system by substitution show work. { - 4.5x - 2y = - 12.5 {3.25x - y = -0.75

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

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