Answer:

Step-by-step explanation:
This is a multiplication problem.
We want to multiply 
We factor to get:

We now cancel out the common factors to get:

We now multiply the numerators and the denominators separately to get.
This simplifies to 
Therefore the simplified expression is 
Answer:
$503.35
Step-by-step explanation:
you just have to plug in the value of each variable into the equation
i hope this helps :)
The soulation is given by s=3 because it makes the value of 3s+12 equal to 21