Alyssa can run 0.75 mile in 35 seconds. About how long will it take her to run 7 miles?

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Ineed i been stuck on this question since yesterday

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