A (17.5) have a great dayyy!! hope it helps :))
The very first one (the very left one)
9 is in parentheses therefore it's elevated above 3 that means you have to do operations on it first.
3 + (-9) = -6
The sum is negative.
On the bottom left, the answer is subtraction property of equality because you need to subtract 4x to the 7x to simplify the equation.