An electrician charges $35 per hour plus a fixed amount for residential work. for a job that took 6 hours, he billed $270. write an equation in the form y = mx + b that represents the cost, c, of hiring this electrician for a job that takes x hours.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

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