Sam packed different boxes with unit cubes. Which box has a volume greater than 30 cubic units?

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?

Askyscraper is 396 meters tall. at a certain time of day, it casts a shadow that is 332 meters long. at what angle is the sun above the horizon at that time?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b