What is the length of the unknown side in the triangle to the right? (C)Hypotenuse= 25 (B)=Unknown (A)=15

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

Three times the sum of a number and seven is negative thirty-six. what is the number?

Ineed with number 6 , explain how to get 1978