What is the value of y if x=30?

Improper question you need to provide more info or post a screenshot.

x=30° (given)

2y+2x=180° ( Supplementary angles )

2y+2×30 ∘ =180 ∘

2y+60∘ =180∘

2y=180−60

2y=120 ∘

⇒y=60 ∘

440,000

Step-by-step explanation: Round each number and then add together.

400,825 rounds to 400,000.

39,557 rounds to 40,000.

400,000+40,000 = 440,000