Any math experts here?

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

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual