Solve 1 third of 18 using a tape diagram

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

The angle of depression from the top of the tree to the tip of the shadow is 25°. find the height of the tree to the nearest tenth. a. 16.8 feet b. 18.2 feet c. 23.4 feet d. 39.7 feet

What is the common difference in the arithmetic sequence? 7, 14, 21, 28, 2 3 4 7