What is 2 thousands +12 hundreds=

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?