Answer:
y=-3
Step-by-step explanation:
5x+7y=-31
(-) 5x-9y+17
-----------------
16y=-48
------------
16 16
y=-3
Answer:
21 in
Step-by-step explanation:
by the Pythagorean theorem we have

notice that the 841 and the 400 don't go squared because they already squared!
Answer:
1,850
Step-by-step explanation:
600+.05(25000)=1,850
Answer:
14. congruent means "THE SAME" so it will be "A" because there all the same letter.
15. D