Solve the problem.When making a telephone call using a calling card, a call lasting 6 minutes cost $2.80. A call lasting 13 minutes cost $5.60. Let f(x) be the cost of making a call lasting x minutes using a calling card. Write a linear function that models the cost of making a call lasting x minutes.
A. f(x) = 0.4x - 7.4
B. f(x) = 
x - 
C. f(x) = -0.4x + 5.2
D. f(x) = 0.4x + 0.4
Answer: D
Mathematics
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Simplify the fraction, if possible.
A. 14
B. 15
C. -15
D. 
Mathematics
Round the number to its given place value.In a town in Texas, the average consumption of soft drinks per day per elementary school student is 15.697 ounces. Round this value off to the nearest tenth.
A. 15.7 oz B. 15.8 oz C. 15.70 oz D. 16 oz
Mathematics
Perform the indicated operations. Write the resulting polynomial in standard form.(x + 12y)(x - 12y)
A. x2 - 144y2 B. x2 - 24xy - 144y2 C. x2 - 24y2 D. x2 + 24xy - 144y2
Mathematics
Solve the equation in the interval [0,2?). sin x = cos 2x
What will be an ideal response?
Mathematics