1.) A toy helicopter costs $64 before sales tax. If the sales tax is 5%, how
much would it cost to buy?

2. A piece of hematite contains 72% iron. if the hematite weighed 160g, how much iron would there be?

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 between 80 and 120.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 between 80 and 120.