If a person's eye level is h meters above sea level and he can see d kilometers to the horizon, then d=3.6√ℎ. Suppose the person can see 13.5 kilometers to the horizon. What is the height of his eye level above sea level?

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?

Which are the possible side lengths of a triangle?