On his lunch break, calvin purchases a burger and drink. the total order is $8.50, of which $1.08 is tax. how much was calvins meal before tax?

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Which polynomial function has x intercepts -1, 0, and 2 and passes through the point (1, -6)

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?