Solve.When making a telephone call using a calling card, a call lasting 6 minutes cost $1.10. A call lasting 15 minutes cost $2.00. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that relates the cost of a making a call, y, to the time x.
A. y = 0.1x - 13
B. y = 0.1x + 0.5
C. y = 10x - 
D. y = -0.1x + 1.7
Answer: B
Mathematics
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Analyze the graph and write the equation of the function it represents in standard form f(x) = a(x - h)2 + k.
A. f(x) = 
(x - 2)2 + 2
B. f(x) = -3(x - 2)2 + 2
C. f(x) = - 
(x - 2)2 + 2
D. f(x) = 3(x - 2)2 + 2
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Solve the equation.log20 (x2 - x) = 1
A. {-4, 5} B. {-4, -5} C. {4, 5} D. {1, 20}
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Solve the radical equation.
= -9
A. {76} B. ? C. {81} D. {86}
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Factor by grouping.20x2 - 15xy + 8xy - 6y2
A. (5x + 2y)(4x - 3y) B. (20x + 2y)(x - 3y) C. (5x - 2y)(4x - 3y) D. (5x + 2)(4x - 3)
Mathematics