Select all ratios equivalent to 3: 10
2: 4, 21: 70, 18: 60, 10: 12

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

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.

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height