Summer uses 0.4 gallon of gasoline each hour mowing lawns. how much gas does he use in 4.2 hours

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

Which shows one way to determine the facts of x3+4x2+5x+20 by grouping