本题目来源于试卷: IB MAI HL Functions Topic 2.2 Applications of Functions，类别为 IB数学
[问答题]
Two IT consulting firms have diffe-- ib(m 6d *wucb:g;w-pc*iwbsv.a mi 0m n4 0dpnex/a5j2 g:ucqec:urent pricing structures. TechMind charges 115 dollars, plus an upfront fee of 250 dollars for booking an appointment. RiddleBreak doesn't /ujmun: pxc542en0qa 0decg :charge for booking an appointment, but the rate is 60 dollars per hour. Let $C_1$(t) and $C_2$(t) be the costs, in dollars, of consulting t hours by TechMind and RiddleBreak respectively.
1.Write down expressions for the costs of consulting, $C_1$ and $C_2$, in terms of the number of hours, t, charged.
2.Find the least number of whole hours of consulting from TechMind for its servicesservices to be a cheaper option.
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