We have the following:

solving for x

The solution of x is equal to 28, therefore 12 is not a solution of the equation
Its impossible to draw a trapezoid with just three right angles.
a trapezoid has 4 sides, which means all the angles inside the trapezoid must add up to 360 degrees.
if you have just 3 right angles (90x3), you already use up 270 degrees. Leaving you with just 90 degrees left, which is also a right angle. That means, there has to be four, if you have at least 3.
Answer:
the answer is A
Step-by-step explanation:
15 and one half is 31/2. 3 and seven eighths is 31/8. 31/2 also equals 124/8. Then the answer is 124/8 - 31/8 is 91/8. Hope that helped.
Integers are negative or positive whole numbers
whole numbers do not include negatives
so ur answer is -3...it is considered an integer, but not a whole number