Arational expression is undefined whenever it’s denominator is zero true or false

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Uestion 1(multiple choice worth 5 points) (05.02)alex wants to paint one side of his skateboard ramp with glow-in-the-dark paint, but he needs to know how much area he is painting. calculate the area of the isosceles trapezoid. isosceles trapezoid with top base 12 feet, bottom base of 18 feet, and height of 6 feet. 72 ft2 84 ft2 90 ft2 108 ft2

Percent increase and decrease. original number: 45 new number: 18