Find the values that make the equation true.
= 
A. a = -3, x = -3
B. a = 4, x = -3
C. a = -3, x = 4
D. a = 4, x = 4
Answer: B
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Multiply or divide as indicated.
A. 12 B. 1.2 C. 2 D. 0.2
Find the unknown value in the percent proportion 
Round to the nearest tenth, if necessary.part = 24, whole = 24
A. percent = 0% B. percent = 1% C. percent = 100% D. percent = 200%
Solve the system of equations by using the inverse of the coefficient matrix. 5x - 6y - 6z = -55 7x + 2y + 3z = 28-8x - 5y + 2z = -51
A. (2, 7, 1) B. (1, -9, -1) C. (9, 1, 9) D. (1, 9, 1)
Solve the problem.The perimeter of a triangle is 49 centimeters. Find the lengths of its sides, if the longest side is 9 centimeters longer than the shorter side, and the remaining side is 4 centimeters longer than the shorter side.
A. 12 cm, 9 cm, 25 cm B. 3 cm, 8 cm, 12 cm C. 12 cm, 9 cm, 21 cm D. 9 cm, 20 cm, 25 cm