15. If 1.2 is the average of 0.2, 0.8, 2.2, and x, what is the
numerical value of x?
+

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Write as a product of two polynomials. 2(3–b)+5(b–3)^2

The length of time it takes to find a parking space at 9 a.m. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. find the probability that it takes at least 8 minutes to find a parking space. (round your answer to four decimal places.)