For this problem, I'd use cross-multiplication.
9/12 = x/8.
When cross multiplying, multiply 12*x and 9*8. This leads to a new equation:
12x = 72.
Then you solve as an algebra problem.
*Divide 12 on both sides*
x = 6.
The answer to your question is 3 43/65
Answer is B
Formula is: P=r(PV)/1-(1+r)-n
r = .065/12 = .00541
P = $90,100
n = 15 x 12 = 180
P= 90,100 X 0.00541 / 1 - (1 + 0.00541)-180
P= $784.87
Not sure what you mean where to multiply from but what you have is (9)(-2)
This means 9 times -2
answer is -18
