(−9)² what is the answer

Acylinder has volume 45π and radius 3. what is it’s height?

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?