Solve.When making a telephone call using a calling card, a call lasting 3 minutes cost $0.80. A call lasting 12 minutes cost $1.70. 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 = 0.1x - 10.3
B. y = 10x - 
C. y = -0.1x + 1.1
D. y = 0.1x + 0.5
Answer: D
Mathematics
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A PDF for a continuous random variable X is given. Use the PDF to find E(X).f(x) = 
A. 5
B. 
C. 
D. 
Mathematics
Translate the word statement into a percent proportion. Do not solve.What percent of 59 is 6?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
Find the slope of the line that goes through the given points.(6, -6), (-8, -6)
A. 0
B. 6
C. 
D. Undefined
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Solve the equation by the method of your choice.x2 + 12x + 15 = 0
A. {6 - 
, 6 + 
}
B. {6 + 
}
C. {-12 + 
}
D. {-6 - 
, -6 + 
}
Mathematics