Which sets are closed under subtraction? Select all that apply. {..., −3, −2, −1, 0, 1, 2, 3, ...}

{1, 2, 3, 4, ...}

{1, 3, 5, 7, 9, ...}

{rational numbers}

my guess is

step-by-step explanation:

40 i don’t know lololol

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.