What is the product 3/4 ×5

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

We just started the introduction into circles and i have no idea how to do this.

Which table shows a proportional relationship between miles traveled and gas used?