Solve. Assume the exercise describes a linear relationship.When making a telephone call using a calling card, a call lasting 3 minutes costs $1.20. A call lasting 13 minutes costs $3.70. 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 making a call lasting x minutes.
A. y = 4x - 
B. y = 0.25x - 9.3
C. y = -0.25x + 1.95
D. y = 0.25x + 0.45
Answer: D
Mathematics
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Find the sum of the series.
A. 48 B. 60 C. 32 D. 56
Mathematics
Find the absolute maxima and minima of the function on the given domain.
on the disk bounded by the circle 
A. Absolute maximum: 72 at 
absolute minimum: 0 at 
B. Absolute maximum: 54 at 
and 
absolute minimum: 18 at 
and 
C. Absolute maximum: 54 at 
and 
absolute minimum: 0 at 
D. Absolute maximum: 18 at 
and 
absolute minimum: 0 at 
Mathematics
Perform the conversion. Round to the nearest hundredth when necessary.443 mi to km
A. 419.08 km B. 469.58 km C. 713.23 km D. 275.1 km
Mathematics
Convert 
to Decimal.
a. 272 b. 4100 c. 4004 d. 8008 e. 8440
Mathematics