The formula a=p(1+r)^2 gives the amount a in dollars that p dollars will grow to in 2 years at interest rate r (where r is given as a decimal), using compound interest. what interest rate will cause $ 5000 to grow to $ 5304.50 in 2 years?

P=presne amount=5000
A=furutre amount which you want to be 5304.50

solve for r

5304.50=5000(1+r)^2
divide both sides by 5000
1.0609=(1+r)^2
sqrt both sides (remember to get positive and negative roots)
+/-1.03=1+r
minus 1 both sides
+/-1.03-1=r

+1.03-1=r=0.03=3%
-1.03-1=r=-2.03=false, no negative percents

answer is 3%

Basic algebra equation. first set up your equation: divide out 9.and now you are left with 2x + 4 = 8.