Fill in the blank spaces
y2 + 15y + 56 = (y + 7)(y +_)
a. –8
b. 8
c. –7
d. 7

z2 + 9z – 90 = (z – 6)(z +mc005-1.jpg)
a. –15
b. 15
c. –9
d. 90

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.