a square with 15 on top and 9 on side and another square with x on top and 4 on side what's x

You seem to be describing two squares, but squares have all sides of equal length. It sounds like you're actually referring to rectangles.

Let's assume the first "square" is a rectangle with a length of 15 and a width of 9, and the second "square" is a rectangle with a length of \(x\) and a width of 4.

If the problem asks for \(x\), it could be that the two rectangles are supposed to be proportional or similar. Rectangles are similar if their corresponding sides are in proportion. For two rectangles to be similar:

\[
\frac{\text{Length}_1}{\text{Width}_1} = \frac{\text{Length}_2}{\text{Width}_2}
\]

Using the given values:

\[
\frac{15}{9} = \frac{x}{4}
\]

To find \(x\), cross-multiply and solve for \(x\):

\[
15 \times 4 = 9

Learn how to solve for x in a problem involving two rectangles with given side lengths, using the proportionality theorem. This problem covers concepts like proportions and ratios, suitable for students in Grades 6-8.

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