Which expression helps you find the length x of a side of a rectangle that has a diagonal of 15 units and a width of 9 units?

Step-by-step explanation:

Step-by-step explanation:

So we are given a rectangle whose width is 9 units, length is x units, and diagonal is 15 units.

Let us draw a diagram based on the above information.

Refer to the attached diagram, as you can notice there is a right angled triangle which means we can apply Pythagorean theorem to find out the value of unknown side x.

Recall that Pythagorean theorem is given by

From the diagram, we have

c = 15

a = 9

b = x

So the equation becomes,

So this the correct equation!

Bonus:

The value of length x is

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step-by-step explanation: