A20-foot ladder is leaning against a tree. the bottom of the ladder is 12 feet away from the bottom of the tree. approximately how high up the tree does the top of the ladder reach? a2.4 feet b6 feet c9.2 feet d16 feet

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.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?