Please hurry it is 6th grade math

b^{2}=\frac{4}{9}

3(10x-y)-5(x-y^2) need this solved asap

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

The length of a rectangular piece of land is 92 yards more than three times its width. the perimeter is 760 yards. find its dimensions.