Solve the system by substitution, if possible.
?
?
A. (?4, 3)
B. ?(16, 14)
C. ??(- 4, - 3)
D. ?(-11, 106)
E. ?(- 16, - 14)
Answer: A
Mathematics
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Solve the problem.Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 25 pounds of feed worth 
per pound by mixing one kind worth $0.14 per pound with another worth 
per pound. How many pounds of the cheaper kind should they use in the mix? (Round to the nearest pound.)
A. 18 lb B. 23 lb C. 9 lb D. 7 lb
Mathematics
Evaluate f(x) at the given value of x.f(x) = x2 + 3; x = 9
A. 84 B. 81 C. 80 D. 86
Mathematics
Solve the quadratic equation.x2 + 2x - 48 = 0
A. x = -6 or x = 8 B. x = -48 or x = 0 C. x = 6 or x = - 8 D. x = -6 or x = - 8
Mathematics
Complete the identity.
= ?
A. cos 2x B. sin 2x C. tan 2x D. cot 2x
Mathematics