Answer:
x = x+9
Step-by-step explanation:
well that is the only way you can do it as we do not know about what x is. also, if you meant by x + (x*9), you can represent that as x*10
The first one is correct, just match the numbers with the corresponding sides of each triangle
Answer:
x=10
Step-by-step explanation:
The two triangles are similar since each triangle is the same shape of right triangle but different sizes. To find x, write a proportion between two equal ratios of side lengths.

Solve by cross multiplying.
28(3x) = 20(4x+2)
84x = 80x + 40
4x = 40
x=10
The median is 10.5 because its the middle line in the box and all you have to do is look at it and you can see it
2 x 117
3 x 78
6 x 39
9 x 26
13 x 18