PSEG Long Island charges its residential customers a little monthly service charge plus an energy charge based on the amount of electric used. The monthly cost of electricity is approximated by the function:
C = f(h) = 37.60+ 0.10h,
where h represents the number of kilowatt hours (kWh) of electricity used in excess of 250 kWh.

(b) Find f (90) and interpret its meaning.
f(90) =

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

Math i have no idea how to do a and b