15r^2s^2t^5, 5r^3s^4t^3, 30r^4s^3t^2

I think is 5r^2s^2t^2 can some one confirm this

a^2(w + z ), a^3(w + z)^2

this one I know is (w +z ) but that is can some one help me to finish it

question 1)

the GCF between 15, 5 and 30 is 5

whereas the GCD between

r^2 s^2 t^5, r^3 s^4 t^3, and r^4 s^3 t^2 is r^2 s^2 t^2, so

your GCF is:

5 r^2 s^2 t^2

question 2)

here the GCF between a^ (w+z)^2, and a^3(w+z)^3, is:

a^2 (w+z)

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