Simplify. Be sure to rationalize the denominator. Assume that all variables represent positive real numbers.
A. 
B. 7
- 1
C. 7
- 7
D. 7
+ 7
Answer: C
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Solve the problem by writing an appropriate system of equations and using the inverse of the coefficient matrix to solve the system.The sum of three numbers is 13. The first, plus three times the second, plus the third, is 1. Two times the first, minus the second, plus the third, is 15. Which of the numbers are odd numbers?
A. 29 B. 29 and 7 C. -7 and -29 D. -7
Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 25 watches B. 36 watches C. 40 watches D. 50 watches
For the pair of vectors, find 
.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Evaluate the expression, given x = -2, y = 3, and a = -4.6a + 2y - 3x
A. -37 B. -12 C. -29 D. 24