1. 3/x=x/?

2. 3/?=?/10

3. 13/z=z/?

4. ?/y=y/10

5. 10/?=?/13

6. 13/?=?/3

These proportions are very strange to me, but its the way the book has it layed out.

Directions say use theorems 7.2 and 7.3 which make no sense to me, but here they are:

7.2 In a right triangle, the length of the altitude to the hypotenuse is the geometric mean between the lengths of the two segments on the hypotenuse.

7.3 In a right triangle with an altitude to the hypotenuse, each leg is the geometric mean between the sum of the squares of the lengths of the legs.