Simplify the expression: 30 5°2 +(216-8

Steve is scuba diving near his home in maui. at one point he is 100 feet below the surface. represent this number with a negative number. if he descends another 5 feet, what negative number will represents his.

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Yesterday i ran 5 miles. today, i ran 3.7 miles. did my percent increase, decrease or is it a percent error? plz i need