The domain is actually the x value of the function, so we need to find the value of x suppose the width is x, the length is then 3x+5 the area is 50^2 inches, so x(3x+5)=50 => 3x^2+5x-50=0 Factor this quadratic equation: (x-5)(3x+10)=0 =>x=5 or x=-10/3 width can not be negative, so the width is 5 the domain is x=5
Interest Amount (I) = P x r x t = 900 x 5% x 3 = 135 So total amount to be paid over 3 years = Principal Amount + Interest Amount= 135 + 900 = 1035 (over 3 years = 36 months)= 1035 / 36 = $28.75 per month
