This is a ratio.
12 km : 3 h
simplify to-
4km : 1 h
which means the hiker traveled 4 km per 1 hour.
We can use the distribution method for both sides:
9 (x+2) = 5 - 2( x - 1 )
9x + 18 = 5 -2x + 2
Move like terms to one side and combine:
9x + 2x = 5+2-18.
11x = -11
x = -1.
This appears to be just an expression we are simplifying, not an equation we are solving. I THINK you are saying that the expression looks like this:

If you rationalize the denominator, you would get this expression:

which, after simplifying, looks like this:

and that's as simple as I can see that one getting. You can't factor anything out of the denominator to cancel with the numerator, so I think you're as simple as you can get there!
Answer: Additional money is $6250.
Step-by-step explanation:
Since we have given that
Amount of investment = $5000
Rate of simple interest = 3%
Let the additional amount of investment be 'x'.
Rate of simple interest = 3.9%
Total annual interest rate on total investment = 3.5%
So, According to question, it would be

Hence, Additional money is $6250.
Answer:
Step-by-step explanation: