IB Mathematics Applications and Interpretation Quiz
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A phone company charges for international calls based on the duration of the call. The cost CC, in dollars, for a call lasting tt minutes is: C(t)={0.990<t≤10.99+0.35(t−1)t>1 C(t) = \begin{cases} 0.99 & 0 < t \le 1 \\ 0.99 + 0.35(t-1) & t > 1 \end{cases}
A customer made a call that cost $8.34. How long was the call in minutes?
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