Which of these expressions cannot be simplified by combining like terms?
5ab3+7−3a2b2+a3b−10, 5ab3+3a2b2+a3b−10, 5ab3+2b(3ab2)+a3b−10, or 5a3b3+3a2b2+a3b3−10ab

can be simplified to by adding the 7 and 10 to get .

cannot be simplified any more by combining like terms.

By distributing the 2b into the parentheses, you can simplify the expression:


Here you can just add:


Thus, the only expression that cannot simplify any more using adding like terms is the second, .

Cis your correct answer