Answer:
1. 15.9 years
Step-by-step explanation:
You must solve this equation:

So 
Take the log left and right:

use the log property that you can put the exponent in front:


n > 15.917
Answer: C is 10''
8^2,6^2=10"
Answer:
x = -3/2 or -1.5
Step-by-step explanation:
You have to get X on one side by itself.
2x + 4 - 7x + 9x = -2
Subtract the 4
2x - 7x + 9x = -6
Combine like terms
-5x + 9x = -6
Combine like terms
4x = -6
Divide by 4
x = -6/4
Simplify
x = -3/2 or -1.5