2,-1,0,1 whichave pair of numbers has a sum of zero

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25

Given: m zade = 60° and m2cdf = (3x + 15) prove: x = 15

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq less than 132. the probability that a randomly selected adult has an iq less than 132 is?