Find an equation of a parabola satisfying the given conditions.Focus at (4, 0), directrix x = -4
A. y2 = -16x
B. y = 
x2
C. x = 
y2
D. -16y = x2
Answer: C
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Solve the problem.When making a telephone call using a calling card, a call lasting 3 minutes cost $1.65. A call lasting 12 minutes cost $5.25. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of a making a call lasting x minutes.
A. y = 0.4x - 6.75
B. y = 0.4x + 0.45
C. y = -0.4x + 2.85
D. y = 
x - 
Factor out the GCF from the polynomial.10m7 - 12m5 + 12m2
A. No common factor B. 2(5m7 - 6m5 + 6m2) C. 2m2(5m5 - 6m3 + 6) D. m2(10m5 - 12m3 + 12)
Evaluate the expression.
?
Fill in the blank(s) with the appropriate word(s).
A boat traveled 48 mi up a river in 4 hours. Returning downstream, the boat took 3 hours. What is the boat's rate in still water, and what is the rate of the river's current?
What will be an ideal response?