When there is a minus before a parenthesis, you must change the sign of the number(s) inside the parenthesis.
(-9) - (-7) × [2 - (-9)]^2 + (-7)
-9 + 7 × [2 + 9]^2 - 7
- 9 + 7 * (11)^2 - 7
-9 + 7*121 - 7
-9 + 847 - 7
831
Answer:
You greatest common factor is

Step-by-step explanation:
You need to find a number and letter which goes into both monomials.
,
Split both monomials up, into each integer and letter.
INTERGERS: 6, 3
LETTER t:
,
LETTER z: 
3 goes into 6 and 3.
goes into
and
.
Nothing goes into
and 0.
You greatest common factor is

Therefore

Answer:
Choice 3
Step-by-step explanation:
Do y2-y1 over x2-x1 to get the answer.