Answer:
x has to be -3 for the answer to be 0
Step-by-step explanation:
The answer is D, i.e. the system was solved via elimination
If you multiply the first equation by 5, the system becomes

If you sum the two equations, you get

And so if you substitute the second equation of system A with this new equation, you'll get system B.
Answer:
4:!
Step-by-step explanation:
4:1 because their are 4 boys for every 1 girl
Set A has a peak at 5. It is also skewed to the right. The center is 5.
Set B also has a peak at 5. Is relatively symmetrical. The center is also 5.
(Sorry about those circle in the back of my picture)
The volume is 13*7*5. Therefore, the answer is 455 in^3