Solve the system using the inverse matrix method.
A. x = 4, y = -1, z = 9; (4, -1, 9)
B. x = 11, y = -13, z = 9; (11, -13, 9)
C. x = 12, y = 0, z = 0; (12, 0, 0)
D. x = 45, y = 57, z = 19; (45, 57, 19)
Answer: B
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Divide. Write the answer in lowest terms and as a whole or mixed number where possible.
÷ 1
A. 
B. 2
C. 
D. 
Find the length of the third side of the right triangle. Give an exact answer and, where appropriate, an approximation to three decimal places.
A. c = 7 km B. c = 9 km C. c = 5 km D. c = 10 km
Write the binomial expansion of the expression.
5
A. -32 - 
y - 
y2 - 
y3 - 
y4 - 
y5
B. 32 + 
y + 
y2 + 
y3 + 
y4 + 
y5
C. -32 + 
y - 
y2 + 
y3 - 
y4 + 
y5
D. -32 - 
y + 
y2 - 
y3 + 
y4 - 
y5
According to automobile association of a country, on March 27, 2009, the national average price per gallon of regular unleaded (85-octane) gasoline was $2.02, and the price of premium unleaded (93-octane) gasoline was $2.23. The cost of the blend of mid-grade unleaded gasoline (92-octane). Determine the constraints for the objective function. ?
A. x ? 0 y ? 0 x + y = 9285x + 93y = 92 B. x ? 0 y ? 0 x + y = 185x + 93y = 92 C. x ? 0 y ? 0 x + y = 922.02x + 2.23y = 93 D. x ? 0 y ? 0 x + y = 922.02x + 2.23y = 92 E. x ? 0 y ? 0 x + y = 922.02x + 2.23y = 85