If it's possible please also show your work
13. Find the length of the altitude of an equilateral triangle whose sides have a length of 8 cm.

14. Find the perimeter of a square with a diagonal that measures 10 in. Leave the answer in simplified radical form.

15. A 14 ft. ladder is leaning against a wall. If the base of the ladder is placed 3.5 ft. from the wall, then how high up the
wall will the ladder reach? Leave the answer in simplified radical form.

16. ABC is a right triangle. AB is the hypotenuse. Determine the length of AC, if AB = 18 cm and BC = 6 cm. Leave the answer in simplified radical form.
AC=