Here, as I can see, you are adding fractions, and making sure you have a common denominator.
12) is correct
13) is correct
You got a common denominator, and added them up! Great job! <span />
Subtract a number from the next number.
39 - 45 = -6
Answer: B. -6
It will tell you if the wall meet at a perfect right angle.
In a right triangle, the sum of the squares of the legs is equal to the square of the hypotenuse. This can be used to test any triangle.
