(1)solve this system using the substitution method: 5x + 3y = 2; -5x –y =10(2) solve this application problem using a system of equations: 32,000 people attended a ballgame at a stadium that offers two kinds of seats: general admission and reserved. the day's receipts were $200,000. how many people paid $13.00 for reserved seats, and how many paid$4.00 for general admission?

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