I'm not sure what your variables are, but I will try task 3 with you.
y=$500(in billions)
x= the number of years that have passed since 2009
percentage of decrease: 1 - % =
so your formula will look like this: y(1 - %)^x
1) montly rate, r = 5% / 12 = 0.416% = 0.00416
2) capital, C = $ 450 = present value
3) time = 11 years => number of periods = 11 * 12 = 132
4) Formula: FV = C * (1 + r) ^ (number of periods)
5) Calculation: FV = $450 * ( 1 + 0.00416)^(132) = $ 779.07
Answer: $ 779.07
B. because you do 16*2*h + 8*2*h and you get 128 + 64 = 192
Answer: 1 and 1/3 or 4/3
6/9 = 2/3
1 x 0.5 = 0.5
2/3 divided by 1/2 = 1 and 1/3 or 4/3
