Answer:
I think D
Step-by-step explanation:
I think that the answer is D, since the angles are not visibly shown to be equal. If you knew answer D, you would then be able to see that segments BC and CD are congruent. I am not 100% sure, however.
This is asking for the number of combinations in which you can pick 8 books out of a group of 13.
The general formula for finding combinations is:

For this example where n = 13, k = 8
1.) 1/4
2.) 25%
First is fraction, sedond is percent
x = total value of merchandise sold (in dollars)
y = take home pay (in dollars)
Job A: y = 0.15x + 750
Job B: y = 0.20x + 675
We want to know when job B's pay will be larger than job A's pay. So set the expression for job B larger than job A, solve for x
0.20x + 675 > 0.15x + 750
0.20x - 0.15x > 750 - 675
0.05x > 75
x > 75/0.05
x > 1500
Answer: Miranda must sell more than $1500 worth of merchandise to have job B pay more than job A.