If Alex can do 15 jumping jacks in 20 seconds, how many can he do in 2 minutes

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Pls the last one and it has to be like number 6

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set