If f(x) = 5x + 40, what is f(x) when x = -5?
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Answer:
Assume a business man banks an amount of principle P, for n years at a compound interest of r%. His accumulated amount after n years will be given by formula:
- P is the principle
- r is the interest
- n is the period
Note that compound interest borrows a hint from the geometric progression series.
- for 5 years, at rate of 10% with principle of 5000;
Accumulated = 5000(1 + 10%)^5
Accumulated = 5000(1 + 0.1)^5
Accumulated = 5000 × 1.61
Accumulated = 8052.55 /=