Answer:3(50+6)
Step-by-step explanation:
It is 31.................
I believe its d because you subtract (-3 -7 1 9) from both sides
Completing the squares tells us exactly what square root we will need to calculate our answer.
Using the formula below you can find these answers:

Does this make sense?
The Pythagorean Theorem states that a² + b² = c², c being the hypotenuse.
Substitute known values into the equation.
7² + 2² = c²
49 + 4 = c²
c² = 53
c = √53
c = 7.28010989
Answer: The hypotenuse's length is 7.3 feet.