Answer: 1134 m^2
Explanation:
First, you would plug in "9" to replace the variable. It would be 7(9) and 4(9). Parenthesis means multiplication.
Then, you would multiply. 7 x 9 = 63, 4 x 9 = 36
The area of a triangle is bh/2. So, 63x36=2268, 2268/2=1134.
I believe the answer is 1134 m^2.