Two dolphins are catching fish when they begin moving to the surface to get a breath of air. They start swimming toward the surface at the same time. The first dolphin is 120 feet below the surface of the ocean, and he swims upward at a rate of 4 feet/second. The second dolphin is 240 feet below the surface, and she swims upward at a rate of 12 feet/second. Which dolphin surfaces first and when?

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

Find the coordinates of point x that lies along the directed line segment from y(-8, 8) to t(-15, -13) and partitions the segment in the ratio of 5: 2.