Answer:
80 1/2
Step-by-step explanation:
First, make 3 1/2 into an improper fraction so it is easier to solve.
3*2=6+1=7; 7/2
7/2*23/1
23*7=161
2*1=2
161/2=80.5 or 80 1/2
Answer:
y = -3x
Step-by-step explanation:
To get slope intercept, you divide both y values by both x values like this

In this case this will be 
This will become 
Divide those two to get -3, and now you get your slope intercept.
Answer:
Exponential
Step-by-step explanation:
The change isn't constant for the volume, so it must be exponential.
Using quadratic regression, the equation is:

a² - b² = (a - b)(a + b)
49x² - 9 = (7x)² - 3² = (7x - 3)(7x + 3)