I NEED HEL:P PLEASE ALL OF THIS

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?

On average a herd of elephants travels 10 miles in 12 hours you can use that information to answer different questions drag each expression to show which is answers

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)