Answer:
Answer: 7y²-x²y+3xy+7x²
Step-by-step explanation:
A . 7y²-x²y+3xy+7x²
Just took he test !
14.8
By the Pythagorean theorem, ...
... x² = 7² + 13² = 218
... x = √218 ≈ 14.7648 ≈ 14.8