1. two identical number
cubes are rolled together 20
times. a sum of 9 is rolled 8
times. what is the
experimental probability of
rolling a sum of 9?

The equation respenting the left table is

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?

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?