Urgent please help me

z=4√5

Step-by-step explanation:

use the Pythagorean theorem to set up a system of equations. a^2 + b^2 = c^2

16+4= 20

20^2 = x^2 + z^2 400=x^2 + z^2 x^2=400-z^2

z^2 = 4^2 + y^2 z^2 = 16 + y^2

x^2 = 16^2 + y^2 x^2 = 256 + y^2 y^2=x^2-256

z^2=16+x^2-256

z^2=16+400-z^2-256

z^2=160-z^2

2z^2=160

z^2=80

z= √80 =4√5

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step-by-step explanation: