Solve the problem.Anne and Nancy use a metal alloy that is 16% copper to make jewelry. How many ounces of an alloy that is 10% copper must be mixed with an alloy that is 20% copper to form 55 ounces of the desired alloy?
A. 38 ounces
B. 24 ounces
C. 33 ounces
D. 22 ounces
Answer: D
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Find the x- and y-intercepts.f(x) = -x2 + 6x - 20
A. 
, (0, -20)
B. No x-intercepts, (0, -20)
C. No x-intercepts, (0, 20)
D. 
, (0, 20)
Solve the system by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets.x - 4y = 3-5x + 20y = -15
A. {(0, 0)} B. {(3, 0)} C. {(x, y) | x - 4y = 3} D. ?
Find an equation y = mx + b that models the quantity y after x units of time.A quantity y is initially 6 and decreases at a rate of 50 per day.
A. y = -50x + 6 B. y = -50x - 6 C. y = -6x - 50 D. y = -6x + 50
Identify the vertex of the parabola.P(x) = -4x2 - 24x - 34
A. (3, -2) B. (-2, 3) C. (3, 2) D. (-3, 2)