Decide whether the composite functions, f ? g and g ? f, are equal to x.f(x) = x2 + 3 , g(x) = 
- 3
A. No, yes
B. No, no
C. Yes, yes
D. Yes, no
Answer: B
Mathematics
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Solve.The surface speed S in fpm (feet per minute) of a rotating cylindrical object is S = 
,where d is the diameter of the object in inches and n is the rotation in rpm (revolutions per minute). If a grinder has a surface speed of 7500 fpm and a rotation speed of 4777 rpm, what is the diameter of the grinder? Use ? = 3.14.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Find the exact value of the expression.sin
A. - 
B. 
C. 
D. 
Mathematics
Solve and check.9y2 + 27y + 20 = 0
A. - 
, - 
B. - 
, - 
C. 
, 
D. 
, - 
Mathematics
Factor the trinomial completely.21t4 - 91t3 - 70t2
A. t2(3t + 2)(7t - 35) B. 7t2(3t + 2)(t - 5) C. (21t3 + 14t)(t - 5) D. 7t2(3t - 2)(t + 5)
Mathematics