Question

Please please heeeeeeeeeeeeeeeeeeeeeeeeeeeeeellllllllllllllllllllllllpppppppppppppppppppppppppppppppppppppppppppp

Answer 1

22.4

Explanation:

a^2 + b^2 c^2

20^2 + b^2 = 30^2

400 + b^2 = 900

b^2 = 500

b = 22.4