Solve the problem.A merchant has coffee worth $20 a pound that she wishes to mix with 90 pounds of coffee worth $90 a pound to get a mixture that can be sold for $50 a pound. How many pounds of the $20 coffee should be used?
A. 210 lb
B. 120 lb
C. 60 lb
D. 105 lb
Answer: B
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Solve.A triangular piece of glass is being cut so that the height of the triangle is 4 inches shorter than twice the base. If the area of the triangle is 168 square inches, how long is the height of the triangle?
A. 24 in. B. 26 in. C. 28 in. D. 14 in.
Use the shape of the graph to name the function.
A. Standard quadratic function B. Standard cubic function C. Square root function D. Constant function
Add or subtract.[(3 + 2i) - (3 + 8i)] - (2 - 2i)
A. 8 + 8i B. 8 - 4i C. -2 - 4i D. -2 + 8i
Eliminate the parameter t. Find a rectangular equation for the plane curve defined by the parametric equations.x = 7 sin t, y = 7 cos t; 0 ? t ? 2?
A. y = 
= 49; -? < x < ?
B. y2 - x2 = 49; -? < x < ?
C. y = x2 - 9; -2 ? x ? 2
D. x2 + y2 = 49; -7 ? x ? 7