Triangle 1 is a scale drawing of Triangle 2, as shown below.

Triangle 1 has sides 4, x and 6, and triangle 2 has sides 6, 10.5, and 9.

Based on the information shown in these triangles, what is the length of the side x?

A.
1.5

B.
7

C.
9

D.
15.75

To find the length of side x, we can set up a proportion based on the corresponding sides of the two triangles.

4/6 = x/10.5

Cross multiply to solve for x:

4 * 10.5 = 6x
42 = 6x
7 = x

Therefore, the length of side x is 7.

So, the correct answer is:

B. 7