Solve the problem.Ron finds 8 books at a bookstore that he would like to buy, but he can afford only 5 of them. In how many ways can he select 5 of the books to buy? How many ways can he make his selection if he decides that one of the books is a must?
A. 3360; 420
B. 6720; 840
C. 336; 210
D. 56; 35
Answer: D
Mathematics
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Decide if the given equation is a solution of the given differential equation.xy" + y' = 16x3, y = x4 + 6 + 5e-x
A. No B. Yes
Mathematics
Rationalize the denominator. 
A. 
B. 
C. 
D. 
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Tell whether the relation is a function.
A. Function B. Not a function
Mathematics
Solve the following system by any appropriate method. If there is no real number solution, so state.xy = 20x + y = -9
A. (-4, 5), (-5, 4) B. (4, 5), (5, 4) C. (4, -5), (5, -4) D. (-4, -5), (-5, -4)
Mathematics