Answers by visitors named: SALLY

idk. we didn't learn this and its not in my book so i need some help

but isnt a and b the same answers

5+5=10 10+10=20 20+20=40 1+1=2 !!!!!!!!!!!!!!!!!:) :) :) :) :) :) :) :) :) :) :) :) :) !!!!!!!!!!!!!!!!