Sarah pays a flat rate plus a rate per minute for her phone plan as shown in the graph above. The cost of Sarah's phone plan, C(t), can be represented by which of the following functions? Responses C(t)=−0.10t+25 C t = - 0 . 10 t + 25 C(t)=0.10t+25 C t = 0 . 10 t + 25 C(t)=25(0.10)t C t = 25 0 . 10 t C(t)=25(1+0.10)t