Solve the problem.The number of different committees of 2 students where the 2 students are selected from a group of n students is given by c(n) = 
(n2 - n). How many different committees of 2 students can be selected from a group of 6 students?
A. 6
B. 1
C. 20
D. 15
Answer: D
Mathematics
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Solve the problem.A spring on a horizontal surface can be stretched and held 0.5 m from its equilibrium position with a force of 50 N. How much work is done in compressing the spring 1.5 m from its equilibrium position?
A. 37.5 J B. 225 J C. 112.5 J D. 75 J
Mathematics
Find the sum-of-the-years'-digits depreciation fraction for the first year.8 years
A. 
B. 
C. 
D. 
Mathematics
If the following defines a one-to-one function, find its inverse. If not, write "Not one-to-one." 
A. Not one-to-one
B. 
C. 
D. 
Mathematics
Use the Factor Theorem to determine whether x - c is a factor of f(x).f(x) = 7x4 + 13x3 - 2x2 + x + 2; x + 2
A. Yes B. No
Mathematics