Solve the Problem $\quad\text { Cost/text } \text { Cost/min }$

question 148

Multiple Choice

Solve the problem.
-A student researches the cost for three cell phone plans. Matrix C contains the cost per text message and the cost per minute over the maximum number of minutes allowed in each plan. Matrix N
Represents the number of text messages and number of minutes over the maximum for 3 months. $\quad\text { Cost/text } \text { Cost/min }$
$C=\left[\begin{array}{cc|l}\$ 0.20 & \$ 0.35 & \text { Plan A } \\\$ 0 & \$ 0.35 & \text { Plan B } \\\$ 0.15 & \$ 0 & \text { Plan C }\end{array}\right.$

Month 1 Month 2 Month 3
$$N = \left[ \begin{array} { r r r } 27 & 60 & 25 \\105 & 27 & 0\end{array} \right] \begin{array} { l } \text { Number of texts } \\\text { Minutes over }\end{array}$$

Find the product $C N$ and interpret its meaning.

• A) \(\left[ \begin{array} { r r r } \$ 42.15 & \$ 21.45 & \$ 5.00 \\ \$ 36.75 & \$ 9.45 & \$ 0.00 \\ \$ 4.05 & \$ 9.00 & \$ 3.75 \end{array} \right]\) The matrix CN represents the additional cost per month for each plan. For example column 1
• Represents the cost for Plan A for months 1, 2, and 3, respectively.
• B) \(\text { } \left[ \begin{array} { r r r }
• \$ 42.15 & \$ 36.75 & \$ 4.05 \\
• \$ 21.45 & \$ 9.45 & \$ 9.00 \\
• \$ 5.00 & \$ 0.00 & \$ 3.75
• \end{array} \right]\)
• The matrix CN represents the additional cost per month for each plan. For example column 1 Represents the cost for Plan A for months 1, 2, and 3, respectively.
• C)\(\text { } \left[ \begin{array} { r r r }
• \$ 42.15 & \$ 36.75 & \$ 4.05 \\
• \$ 21.45 & \$ 9.45 & \$ 9.00 \\
• \$ 5.00 & \$ 0.00 & \$ 3.75
• \end{array} \right]\)
• The matrix CN represents the additional cost per month for each plan. For example row 1 Represents the cost for Plan A for months 1, 2, and 3, respectively.
• D)\(\text { } \left[ \begin{array} { r r r }
• \$ 42.15 & \$ 21.45 & \$ 5.00 \\
• \$ 36.75 & \$ 9.45 & \$ 0.00 \\
• \$ 4.05 & \$ 9.00 & \$ 3.75
• \end{array} \right]\)
• The matrix CN represents the additional cost per month for each plan. For example row 1Represents the cost for Plan A for months 1, 2, and 3, respectively.

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