Suppose that height of community college students is a normally distributed random variable with a mean of 66 inches and a standard deviation of 5 inches. Calculate the Z-score for a student whose height is 70 inches. Just stating an answer is not enough – you need to show how you are calculating the Z-score.

X2 + y 2 = 36 x + y = 6 solve the system of equations.

What is the expression in factored form? 225x^2 - 144 a. 9(5x+4)^2 b. 9(5x-4)^2 c. 9(4x+5)(4x-5) d. 9(5x+4)(5x-4)

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.