That is the answer because: Following the distributive property 4*5a=20a 4*-2b=-8b -2*4a=-8a -2*-5b=10a So now you have 20a-8b-8a+10a So combine like terms 12a+2b
In order to solve this problem, you need to find out how 3 of something is 30 In this case, you multiply 10. Sean= 3×10=30 Ryan= 4×10=40 Justin= 5×10= 50 30+40+50= 120 The answer is $120 Hope this helps