Find the GCF of
30
90
210

Greatest common factor (GCF) of 90 and 210 is 30. We will now calculate the prime factors of 90 and 210, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 90 and 210.

Step-by-step explanation:

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)