Answer: C
Step-by-step explanation:
The formula to find average rate of change is 
. Since the problem is asking for the average rate of change from the second to fifth year, we plug in a=2 and b=5.
f(5)=420.4
f(2)=408.04
Now, we get 4.12 dollars per year for the average rate of change.
In mathematics, a rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. Since q may be equal to 1, every integer is a rational number. Wikipedia
To get better at 12's:
Write down on your paper your 1's facts in column skip 5 and 11 going to 14 (a vertical line - line that goes up and down). To the right of that column, write your two's facts 0 to 8 and repeat again. Then you will have your 12's! Should look as follows
12's:
0 0 = 12 x0
1 2 = 12 x1
2 4 = 12 x2
3 6 = 12 x3
4 8 = 12 x4
6 0 = 12 x5
7 2 = 12 x6
8 4 = 12 x7
9 6 = 12 x8
10 8 = 12 x9
12 0 = 12 x10
13 2 = 12 x 11
14 4 = 12 x 12
Subtract 1/2 mile for the two-way trip of walking. Then multiply the 3 by 2 to get how far the bus drove.
so the answer would be:
6
Hope this helps
