I choose the first bubble because as you can see there are more dots on 50% and 60% so i think the best answer is A
7(x-2y)= seven times(7x) the difference(-) of x and twice y(2y).
Answer: The Pythagorean theorem is used to find a side. When you need to find c, a and b should equal it. Not any random number squares and then added together will make a random number squared equal.