Write a matrix equation equivalent to the system of equations.10x - 12y + 3z = 8 10y - 12z = 10
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Answer: B
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Graph the equation.(x - 4)2 + (y + 1)2 = 4
A. 
B. 
C. 
D. 
Solve the problem.A stockbroker sold 5 shares of stock for $38.41 each. What was the total amount of the sale?
A. $191.95 B. $192.15 C. $192.16 D. $192.05
Solve the equation. Express radicals in simplest form.
- 
= 
A. 
B. 
C. ?
D. 
Natsano has at most $60,000 to invest in the common stocks of two companies. He estimates that an investment in company A will yield a return of 30%, whereas an investment in company B, which he feels is a riskier investment, will yield a return of 40%.
If he decides that his investment in the stocks of company A is to exceed his investment in the stocks of company B by at least $30,000, determine how much he should invest in the stocks of each company in order to maximize the returns on his investment. Investment in company A $ __________. Investment in company B $ __________.