Solve the system using matrices. 5x + y = 28 6x + 4y = 28
A. (6, -2)
B. (-2, -6)
C. (-2, 6)
D. No solution
Answer: A
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Solve the problem.For what value of r does the infinite series 1 + 4r + r2 + 4r3 + r4 + 4r5 + r6 + . . . converge?
A. |r| < 1
B. |r| < 
C. |r| < 2
D. |r| < 4
Find the focus and directrix of the parabola.x = 4y2
A. (0, 1/16); x = 1/16 B. (1/16, 0); x = -1/16 C. (1/4, 0); x = -1/4 D. (0, 1/16); y = -1/16
Solve the problem. Assume all numbers are approximate unless otherwise stated or the number has been determined by a definition or counting process.At some point in the decimal equivalent of a rational number, some sequence of digits will start repeating endlessly. An irrational number never has an endlessly repeating sequence of digits. If the fraction 
is a rational number, which decimal equivalent digits indicate this?
A. 15 B. 13 C. 3 D. The fraction is irrational.
Express as a sum, difference, and product of logarithms, without using exponents.logb 
A. 
logb x - 
logb x + 3logb z
B. 
logb x9 + logb y5 - logb z6
C. 
logb x + 
logb y - 3logb z
D. 
logb x + 5logb y - 6logbz