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Choice C)

The variable y is on one side of the equation. The expression on the other side of the equation shows the relationship between x and y

In other words: y is all by itself on one side, while x is buried in an expression on the other side.

For instance, one such equation could be y = 2x+5.

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.