(page 193; 2 points): if x is a random variable having the standard normal distribution and y=x2 , show that cov(x, y)=0 even though x and y are evidently not independent

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Jim had 3,067.48 in his checking account he wrote a check to pay for two airplane tickets. his account now has 1,845.24.

Aparking garage charges $1.12 for the first hour and 0.50 for each additional hour. what is the maximum length of time tom can park in the garage if we wishes to play no more than $5.62