Equilateral triangle
Explanation:
All of the sides are equal
12a^2 / 6b. This one is multiplied by 3/3 which equals one which keeps it the same.
Answer:
Graph is attached below
Yes, it is a function
The total rental cost is $26
Step-by-step explanation:
Steps are shown in the graph.
However, to type them out here:
Write down a function of x:
daily rental cost
Then place the numbers in: 
1. the question is asking you to multiply the two function expressions together
2. so all we do is (3x - 1)(x² + 4) which gives you 3x³ + 12x - x² - 4