Please help i will give crowns

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

Is the square root of 4 plus the square root of 16 rational?

Acircle has a circumference of 28.36 units what is the diameter of the circle