Which graph shows y and x in a proportional relationship? Pls help

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?

Which expression is equivalent to sq-80

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.