A Certain Calling Card Costs 6

question 105

Multiple Choice

A certain calling card costs 6.3 cents per minute to make a call, rounded up to the nearest minute. However, when the card is used at a pay phone, there is an additional 63 cent connection fee. If is the charge from a pay phone for a call lasting t minutes, create a table of charges for calls lasting close to 1 minute and use it to find the following limit, if it exists. Round your answer to the nearest cent. ​ ​

• A)$0
• B)$0.56
• C)$0.69
• D)$0.78
• E)does not exist

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Definitions:

pH Solution

A measure of the acidity or alkalinity of a solution, on a scale of 0 to 14, where 7 is neutral, values below 7 are acidic, and values above 7 are alkaline.

Ions

Atoms or molecules with a net electric charge due to the loss or gain of one or more electrons.

Single Covalent

A type of chemical bond where two atoms share one pair of valence electrons, resulting in a stable molecule.

Ionic Bond

An ionic bond is a type of chemical bond formed through the electrical force between oppositely charged ions.