Tell which property the statement 7(4+a)=7(a+4) illustrates

The commutative or associative property! Hope that helps!

Step-by-step explanation:

-The expression represents the profit= P(x)=70x+50 and profit on selling of 240 cell phones =$16850.

Explanation :-

Given: Revenue function=

Cost function=

As profit is the difference between revenue and cost.

Thus Profit function = Revenue function-Cost function

Now, if 240 cell phones are sold , then put x=240 in the profit function such that

Profit=P(240)=70(240)+50=16800+50=$16850.

Thus, the expression represents the profit= P(x)=70x+50 and profit on selling of 240 cell phones =$16850.