First, you need to multiply each of these numbers. This is a rectangle so you would do l*w, l*h, and h*w. You would do all of these things and then multiply each expression by 2 to complete the equation. Then add all of them together and you have your answer. The reason you multiply by two is because there are 2 versions of this for each equation. The top and bottom, the two vertical sides, and the two horizontal sides. 7.5*4.5*2=67.5, 7.5*3.25*2=48.75, and 4.5*3.25=29.25. Now add. 67.5+48.75+29.25=145.5 as our grand total.
The answer is 145.5in^2
Answer: No. The answer to this system is y=−85 and y=5, and if you plot that and (3,4) on a graph (I did it on desmos), you will see that it is one square down from the system, meaning it is not a solution to the system. Hope this helps and have a great day!
Attached a solution and showed work.
