Find the domain of the composite function (g ? f)(x). Write the domain in interval notation.f(x) = 
, g(x) = 
A. (-?, 9) ? (9, ?)
B. (-?, 0) ? (0, ?)
C. (-?, 0) ? (0, 9) ? (9, ?)
D. (-?, 0) ? 
? 
Answer: A
Mathematics
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Solve.For modern automotive engines, horsepower (hp) is calculated as hp = 
.If an engine has a peak horsepower of 310 hp at 5200 rpm, what is the torque of the engine at this speed? (Round to the nearest whole number, if necessary.)
A. 311 lb ft B. 309 lb ft C. 313 lb ft D. 307 lb ft
Mathematics
Add and simplify.
+ 
+ 
A. 
B. 
C. 
D. 
Mathematics
Factor completely. State that the polynomial is prime if it cannot be factored.x2 + 8x + 15
A. (x + 15)(x + 8) B. (x - 5)(x - 3) C. (x + 5)(x + 3) D. (x + 15)(x - 1)
Mathematics
Solve the system using Gauss-Jordan elimination.
?
?
A. 
?
B.
?
C.
?
D.
?
E.
?
Mathematics