The area of the rectangle is 93.6cm calculate the width

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

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.