PLEASE HELP ME IM BEING TIMED????

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1 Answer
KillerBunny
Jun 18, 2018

#d(4)=68#

#4# hours

cycled #68# miles total

Explanation:

Plug #t=4# in the fomula to get

#d(4)= 12*4+20 = 48+20=68#

Since #t# represents the number of hours cycled, #t=4# means #4# hours cycled.

#d(t)#, instead, represents the miles cycles, so #d(4)=68# means #68# miles cycled after #4# hours

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