A book seller bought 80 copies of books at 3.50 per copy . He sold each of them at 4.20 , find the total price and profit cost price

Tim earns $120 plus $30 for each lawn he mows.write an iniqualityvto represent how many lawns he needs to mow to make more than $310

Over the last 4 seconds, a snail has traveled 4/9 of an inch. if the snail traveled the same distance each second, how far did it travel each second?

If jobs arrive every 15 seconds on average, what is the probability of waiting more than 30 seconds?