A train left NYC at 9:00am, travelling westbound to Chicago at 70mph. Two Hours later, another train left Chicago travelling at 90 mph
headed to NYC. At what time did they pass each other?

What is the definition of exponential decay?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)