If 78 sit-ups is done in 2 minutes how many can be done in 5 minutes

195 sit-ups

Step-by-step explanation:

If 78 are done in 2 minutes, then

78/2 = 39   sit-ups are done per minute, so

39(5) = 195 sit-ups are done in 5 minutes

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.