How do i show the value of the expression, and where to group symbols so the value equals 45

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with