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? a. the first dolphin, after 10 seconds b. the first dolphin, after 30 seconds c. the second dolphin, after 15 seconds d. the second dolphin, after 20 seconds

G(x)=x2-16xb=-16, so =16 = 649(x) = (x2 - 16x + 64) - 649(x) = (x - 1)2-

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.