What is the value of a for the following circle in general form?

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

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x

Edger needs 6 cookies and 2 brownies for every 4 plates how many cookies and brownies does he need for 10 plates