Answer:
a = 15
Step-by-step explanation:
This is your given:

You are going to want to get a alone to get what a equals.

Multiply 3 on both sides to get the a alone

Domain: 
Range: 
The graph is continuous in the interval 
The value of y would decrease if x increases and the sum stays the same.
Answer:
Step-by-step explanation:
i think 90