Answer: first option.
Step-by-step explanation:
Find the common difference d of the arithmetic sequence:

Then the formula for the 101st term is the shown below:

Where:

Substitute values into the formula. Therefore, you obtain:

10x^2 - 35x....the GCF is 5x
5x(2x - 7) <==
Unfortunately I can not answer this question because there are no underlined digits in your question
45 black dogs because 2/3 of 60 is 45