Use the echelon method to solve the system of two equations in two unknowns. 7x + 8y = 8-2x + 4y = 4
A. (-1, 2)
B. (0, 2)
C. (0, 1)
D. No solution
Answer: C
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Draw the angle in standard position and state the quadrant in which the terminal side of the angle lies or the axis on which the terminal side of the angle lies.-120°
A. Quadrant III
B. Quadrant II
C. Quadrant III
D. Quadrant II
Factor completely.60x2 + 64x + 16
A. 4(3x + 2)(5x + 2) B. (3x + 2)(5x + 2) C. 4(3x + 2)(5x - 2) D. 4(3x + 1)(5x + 16)
Perform the indicated operations and express your answer in the form a + bi. 
A. ±9
B. -9i
C. 9i
D. i
Let Q represents a mass of radioactive radium 
(in grams), whose half-life is 1,599 years. The quantity of radium present after t years is 
. Determine the quantity present after 500 years. Round to the nearest hundredth of a gram, if necessary.
a. 0 g b. 0.31 g c. 0.81 g d. 1.61 g e. 2 g