10, 0, -10
You just have to subtract by 10
3 x (7+2) all you have to do is add 7+2 and that is 9 and then you have to multiply 3 x 9
Answer: <em>one solution.</em>
Step-by-step explanation:

<em>This equation has one solution: x = 6.</em>
Remember that the area of a rectangle is length times width; since we don't know the width, we'll use the Pythagorean theorem to find it first:

Where l is the leg, and h the hypotenuse. We know that one of the legs, the base has a measures 34.3 inches and the hypotenuse a measures 42.1 inches.
Replace the values to get:


Now that we know the width (w), we just net to multiply it by the length to get our area:

We can conclude that the correct answer is <span>B) 836.9 in.</span>