Cook Parsons
01/15/2024 · High School
The cost of calling Raymond's friend in Singapore is \( \$ 3.00 \) plus \( \$ 0.40 \) per minute. The cost as a function of time is shown in the graph. Write an equation that represents the cost as a function of the number of minutes. Identify the slope and \( y \)-intercept and describe their meanings. Find the cost of a 20 -minute call.
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The cost function is \( C(m) = 0.40m + 3.00 \). The slope is \( 0.40 \), indicating a cost increase of \( \$0.40 \) per minute. The \( y \)-intercept is \( 3.00 \), representing the initial connection cost. The cost of a 20-minute call is \( \$11.00 \).
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