Cos 90° = 1
Step-by-step explanation:
Cos 90° = 1, Because The angles are complements
5x-x=-2-7
4x=-9
x=2/3 or x=-2/3
Since there are 2 answers, it is not one solution.
Answer: a) $135,838.21 b) $46,130.05
<u>Step-by-step explanation:</u>

- A: accrued amount (balance)
- P: principal (initial amount invested)
- r: interest rate (in decimal form)
- t: time
(a) Given:
- A = 400,000
- P = unknown
- r = 12% = 0.12
- t = 9

(b) Given:
- A = 400,000
- P = unknown
- r = 12% = 0.12
- t = 18
