Simplify the expression. Assume that all variables represent nonnegative real numbers.4
- 
+ x
A. 
(-2x2 + 3x + 6y)
B. 
(-3x2 + 2x + 4y)
C. 
(3x2 - 2x + 4y)
D. 
(2x2 - 3x + 6y)
Answer: B
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Translate to an equation and solve. 2
% of what is 57 ?
A. 22,800 B. 1.43 C. 228 D. 2280
Solve the system. Express the solution in the form (x, y, z, w). 2y + w = -5 x + y + 6z - w = 11 2x + z + 6w = 7 x + y + 3z = 7
A. {(12, -4, 3, -2)} B. {(6, -4, 2, -2)} C. {(6, -2, 3, -1)} D. {(6, -2, 1, -1)}
Draw the graph of the equation.x2 + 3y = 0
A. 
B. 
C. 
D. 
Solve the problem.A chemist needs 120 milliliters of a 39% solution but has only 23% and 71% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 40 mL of 23%; 80 mL of 71% B. 30 mL of 23%; 90 mL of 71% C. 80 mL of 23%; 40 mL of 71% D. 90 mL of 23%; 30 mL of 71%