Assuming the inteest is annual, since it's simple that means we just have to analyze:
, where r is our interest rate as a decimal, t is time, p is our principal investment and A is our ending value. So, in the context of our problem this becomes:
, which when evaluated by our trusty calculator becomes:
7657.68938,
which is rounded to 7500 in the problem.
Step-by-step explanation:
x=y
y=1/z^3
Now,
for equation,
x=y=1/z^3

Select the two binomials that are factors of this trinomial.


We got the factors as :

and

