Which property of addition is shown below?

a + bi + c + di = a + c + bi + di

identity property
associative property
commutative property
inverse property

well, since the commutative property states that no matter how the numbers are arranged, the outcome is still going to be the same, i would say that this is demonstrating the commutative property. correct?

Consider the given expression:

a+bi+c+di = a+c+bi+di

We have to identify the property of addition in the above expression.

Since, we can observe here that (bi+c) is expressed as (c+bi).

Commutative property of addition states that the numbers can be added in any of the order. Mathematically, it states that a+b = b+a.

Here, (bi+c) is replaced by (c+bi), whether 'b' is added to 'ci' or 'ci' is added to 'b', the result is always same.

Therefore, commutative property of addition is the correct answer.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: