Which polynomial is prime?

x2 – 36
x2 + 16
x2 – 7x + 12
x2 – x – 20

Anne is twice as old as bill, and bill is 3 years older than christie. the sum of anne s and christie s ages equal 72. find their age difference.?

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 are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)