An engine on a test stand was operated at two fixed settings, each with an appropriate load. At the first setting, fuel consumption was 1 gal every 15 min. At the second setting, it was 1 gal every 20 min. The test took 10 h, and 37 gal of fuel were used. How long did the engine run at each setting?
A. The engine ran for 7 h at the first setting,
The engine ran for 3 h at the second setting.
B. The engine ran for 3 h at the first setting,
The engine ran for 7 h at the second setting.
C. The engine ran for 7.5 h at the first setting,
The engine ran for 2.5 h at the second setting.
D. The engine ran for 4 h at the first setting,
The engine ran for 6 h at the second setting.
E. The engine ran for 6 h at the first setting,
The engine ran for 4 h at the second setting.
Answer: A
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Solve the problem.The ellipse 
+ 
= 1 is shifted horizontally and vertically to obtain the ellipse
+ 
= 1.Find the foci of the new ellipse.
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Write in simplified form and list all restrictions on the domain.f(x) = 
A. f(x) = 
, x ? 8
B. f(x) = - 
, x ? 8
C. f(x) = - 
, x ? -8
D. Cannot simplify
Determine if the given ordered pair is a solution to the equation.-15x - 17y = -83, (1, 4)
A. Yes B. No