Hector must find the sum of 50 + 83 + 50 by using mental math. Which property allows Hector to simplify the equation to 50 + 50 + 83 and find an equivalent sum? associative property
commutative property
distributive property
identity property

The associative property because it allows you to group together numbers to make it easy to add.

I hope this helps!

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the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.