Solve the problem.Ellen wishes to mix candy worth $2.43 per pound with candy worth $3.57 per pound to form 30 pounds of a mixture worth $3.19 per pound. How many pounds of the more expensive candy should she use?
A. 12 pounds
B. 20 pounds
C. 10 pounds
D. 25 pounds
Answer: B
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Use Newton's Law of Cooling to solve the problem.A loaf of bread is removed from an oven at 
and cooled in a room whose temperature is 
. If the bread cools to 
in 20 minutes, how much longer will it take the bread to cool to 
A. 27 min B. 19 min C. 8 min D. 7 min
Subtract.(20a4 - 16a2) - (-8a4 - 13a2)
A. 25a6 B. 28a4 - 29a2 C. 12a4 - 29a2 D. 28a4 - 3a2
Solve the problem.In 1992, the population of a country was estimated at 5 million. For any subsequent year, the population, P(t) (in millions), can be modeled using the equation 
where t is the number of years since 1992. Determine the year when the population will be 39 million.
What will be an ideal response?
Sketch the graph of the quadratic function by finding the vertex, intercepts, and determining if the graph opens upward or downward.f(x) = -2x2 - 8x
A. 
B. 
C. 
D. 