Geometry what is the probability of getting heads when flipping a coin and getting a number greater than or equal to 3 when rolling a single die?

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?

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?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1