If the population of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill, what will the ant hill population be in 20 days?

400

Step-by-step explanation:

The current number is 100, it doubles every ten days, and you're asking what the size will be in twenty days.

Beginning:

100 ants (ten days pass)

100 x 2 = 200

Middle:

10 of the 20 days have passed

Your new number is 200 ants

End:

200 ants (ten days pass)

Since every ten days the size doubles: 200 x 2 = 400

400 ants after 20 days

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step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.