Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. 
- 
B. 
+ 
C. 
- 
D. 
Answer: C
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Translate the problem to a system of equations, then solve using matrices.A merchant has coffee worth $30 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?
A. 250 lb B. 300 lb C. 125 lb D. 150 lb
Convert to Fahrenheit. Use the formula F = 
C + 32 or F = 1.8C + 32. Round your answer to the nearest tenth if necessary.2100°C
A. 1187.0°F B. 3786.4°F C. 3812°F D. 3837.6°F
Graph the ellipse.
+ 
= 1
A. 
B. 
C. 
D. 
Provide an appropriate response.If the points in the table lie on a parabola, write the equation whose graph is the parabola.
A. y = -3x2 + 12x - 9 B. y = -3(x + 2)2 + 3 C. y = -3(x + 2)2 - 3 D. y = 3x2 + 12x - 9