Answer:
Definition: Exponents, or powers, are a way of indicating that a quantity is to be multiplied by itself some number of times.
Example: 




V=hpir^2
r=10
v=6283
6283=hpi10^2
6283=100hpi
divide both sides by 100
62.83=hpi
aprox pi=3.141592
divide both sides by pi
19.9994143=h
so about 20 inches
It's the first one you can just add or multiply the expressions to get the answer
Answer:
$84
Firstly, what we must do, is establish a system of equations:


Due the circumstances, it is decided we will use the method of substitution:


↓

Now, we solve the 2-variable equation above:








Now, we must see how much money each one of them had & the price of the jacket:
Now we know that Jim had $126. In other words, $126 is
of his money (total money).
So, if Jim has $126, which corresponds to
of his money,
of his money is:



Hope it helped,
BiologiaMagister