Is each relation a function? how do you know? y=x2+3

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?

If a is a nonzero real number then the reciprocal of a is

Predict which statements are true about the intervals of the continuous function. check all that apply