Write an equation to represent this problem and find the number. 1. the sum of fifteen and six times a number t is eighty-one. what is the number?

t = 11

Step-by-step explanation:

15+6t =81 subtract 15 from both sides and you get 6t = 66 then divide both sides by 6 and you get 11. so the anwser is t=11

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

the answer is 99.