Rectangle ABCD with vertices A(2,8), B(8,6), C(7,3), and D(1,5), is reflected across the x-axis. Find the images coordinates

What is the volume of this square pyramid?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Prove that 16^4-2^13-4^5 is divisible by 11.