Hi- someone help -v- sorry for so many questions

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

What is the base of the exponential expression of 4 to the power of 5

Caitlin had 402. in her bank account.she withdrew $15.each week to pay for swimming lesson. she now has $237.