Jakob is asked to simplify the expression -3a+4b+5a+(-7b) he writes: -3a+4b+5a+(-7b)= -3a+5a+4b+(-7b) which property allows him to do this? a)the associative property b)the commutative property c)the distributive property d)the additive identity property

The property that allows him to do that is b) commutative property

Commutative property is a property for addition or multiplication which allows us to change the order of operands without changing the result.
In this problem, Jakob changes the order 4b+5a into 5a+4b

(m+11n)^2=(m+11n)(m+11n)=m^2+11mn+11mn+121n^2=m^2+22mn×121n^2 for example; use foil: (a+b)(a+b)first. a^2outside. abinside. ablast. b^2