Which equation below illustrates the associative property of addition? \left(2+8\right)+\left(1+9\right)=\ left(8+2\right)+\left(9+1\right)(2+ 8)+(1+9)=(8+2)+(9+1)
5\left(2+7\right)=10+355(2+7)=10+35
5+2\left(3+4\right)=5+6+85+2(3+4)=5 +6+8
\left(3+7\right)+2=3+\left(7+2\righ t)(3+7)+2=3+(7+2)

chad should not have included the values (1, 2) and (3, 6) because that would mean he only had half a healing card.

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.