I'm just trying to help. :)
Answer:
140m^2
Step-by-step explanation:
You take the blh/2
(7*5*8)/2
You get 140
So, to solve this, you just plop those x and y values into the equation. So:
3(8) -2(-5)= 6
24- (-10) =6
34=6
34=/=6
Since these two are not equal, the ordered pair <em />is not a solution.
One pound = $3.50
You are solving for 2 1/4 (or 2.25)
Multiply the two numbers
2.25 x 3.50 = 7.875
2 1/4 pounds cost $7.875 or ~$7.88
~
Part A:
In the purple writing, I found the height of the triangle using the Pythagorean theorem.
I think this is what the question is calling the "height of the box".
height of the box = 15 cm
Part B:
The amount of cardboard needed for the sides will be the lateral area of this prism.
lateral area = perimeter of triangle * height of prism
lateral area = (16 + 17 + 17) * 20
lateral area = 50 * 20
lateral area = 1,000 cm2