Use the formula for 
to solve.In how many ways can a student work 7 out of 10 questions on an exam?
A. 120
B. 10,000,000
C. 720
D. 21
Answer: A
Mathematics
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Find the value of df-1/dx at x = f(a).f(x) = 3x2, x ? 0, a = 5
A. 
B. 30
C. 
D. 
Mathematics
Evaluate the expression.(-7)2
A. -14 B. -49 C. 14 D. 49
Mathematics
Find the least common denominator of the rational expressions.
and 
A. x( x - 9) B. x( x + 9)( x - 9) C. ( x2 + 9)( x2 - 9) D. x( x + 9)( x - 9)2
Mathematics
Graph the solution set of the system of inequalities or indicate that the system has no solution.-1 ? y < 9
A. 
B. 
C. 
D. 
Mathematics