A restaurant owner buys 9 bolts to install an awning. The 9 bolts cost $8.55. The awning looks so nice, she decides to install another one, but needs 2 more bolts. How much do another 2 bolts cost?

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.