Which symbol gives you more information about two numerical expression

Write a numerical expression that satisfies all of the following conditions. 1.)the only number used in the expression is 5 2.)at least one exponent other than 1 is used 3.)when the expression is evaluated, the answer is greater than 40 and less than 50

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?