CMP3_G8_TM_ACE1
64. At Yvonne’s Auto Detailing, car washes cost $5 for any time up to 10 minutes, plus $.40 per minute after that. The managers at Yvonne’s are trying to agree on a formula for calculating the cost c for a t-minute car wash. a. Sid thinks c = 0.4t + 5 is correct. Is he right? b. Tina proposes the formula c = 0.4(t – 10) + 5. Is she right? ................
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