Answer:
x=13
Step-by-step explanation:
if you will substitute the value of f(x) with 5, you will get the following equation:
5=2x-21
2x=26/÷2
x=13
(I didn't know what you ment when you wrote x2, is it x square or 2X)
I really hope it was the second one, cause that's how I solved it.
Answer:

Step-by-step explanation:


Answer:
lol I don't know it I need levels
Answer: x+y=25000
int- 0.06x +0.085 =2000
multiply by 60
multiply interest by 100
60x+60y=60*25000
60x+85y=2000000
25y=500000
divided both by 25
y=20000 (8.5%)
x=5000 (6%)
Step-by-step explanation: