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I don't understand.

 

 Sep 25, 2020
 #1
avatar+234 
+1

(r*s)(t) means r(s(t)), where you plug t into the function s, and then put the value you get from that into r.

for option a, substituting s(t)=t+f into r is 2(t+5)+1

=2t+10+1

=2t+11

this is the result we were looking for, so the answer is a

 Sep 26, 2020

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