c = 0.429t
step-by-step explanation:
the constant rate at which carlos harvests cassava is 35 minutes per 15 cassavas 15/35 = 0.429 cassava per minute
therefore, an equation that models the number of cassava (c) that harvest carlos in a time (t) is the following:
where t is the time in minutes.
this means that when 35 minutes have elapsed 15 cassava have been harvested, at 70 minutes 30 cassava have been harvested and so on.