Select the property not used in the following (2+a) - 7 (a + 2) - 7 a + (2 - 7) a + (-5) a - 5 associative commutative distributive subtraction

Can someone show me the steps to solve the problem?

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

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