an object starts from rest and accelerates at a rate of 4 m/s^2 for 3 seconds. What is its displacement from the start position?

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?

How do you solve a question like this?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.