Answer:
- 90
Step-by-step explanation:
Hypothenus = sqrt ((x^2 - y^2)^2 + (2xy)^2) = sqrt(x^4 - 2x^2y^2 + y^4 + 4x^2y^2) = sqrt(x^4 + 2x^2y^2 + y^4) = sqrt(x^2 + y^2)^2 = x^2 + y^2
10 - 2x = -30
-2x = -40
2x = 40
x = 20
Answer:
the first one and the third one
Step-by-step explanation: