### Exercise condition:

5
Evaluate the value of $$x$$ and $$MZ$$ from the following triangle $$XYZ$$ if $$XM$$ is the altitude from the vertex $$X$$ to the base $$YZ$$ and $$∠XMZ = (x +$$ 21$$)°$$ with $$MZ = 2x$$ yards.

The value of $$x$$ is°.

The length of the $$MZ$$ is yards.