Ineed to explain and answer questions #3 #4 and #5 i will give brainliest!

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?

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

What is the radius of the cone in the diagram? round your answer to the nearest whole number