Help me plz with this problem

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

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?