Solve the problem.Barnes and Able sell life, health, and auto insurance. Their sales, in dollars, for May and June are given in the following matrices. Life Health AutoMay: 
June: 
Find a matrix that gives total sales, in dollars, of each type of insurance by each salesman for the two-month period.
A. 
B. 
C. 
D. 
Answer: D
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Simplify.
+ 
+ 
A. 
B. 
C. 
D. 
Graph.48x2 + 27y2 = 432
A. 
B. 
C. 
D. 
Solve using Cramer's rule. 9x - 6y - 4z = -19-2x + 7y - 6z = 37-4x - 3y + 8z = -25
A. (3, -7, -1) B. (3, 7, 1) C. (4, 5, 1) D. (7, 1, 7)
An investor has $450,000 to invest in two types of investments. Type A pays 6% annually and type B pays 7% annually. To have a well-balanced portfolio, the investor imposes the following conditions. At least one-third of the total portfolio is to be allocated to type A investments and at least one-third of the portfolio is to be allocated to type B investments. What is the optimal amount that should be invested in each investment?
A. $160,000 in type A (6%), $290,000 in type B (7%) B. $0 in type A (6%), $450,000 in type B (7%) C. $450,000 in type A (6%), $0 in type B (7%) D. $300,000 in type A (6%), $150,000 in type B (7%) E. $150,000 in type A (6%), $300,000 in type B (7%)