Martin is exercising on a treadmill. The speed of the treadmill is set at exactly 4 miles per hour. If he continues running at this speed, how long will it take Martin to run 28 miles?

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

James is playing his favorite game at the arcade. after playing the game 33 times, he has 88 tokens remaining. he initially had 2020 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays