A brick staircase has a total of 20 steps The bottom step requires 100 bricks. Each successive step requires 3 fewer bricks than the prior one. How many bricks are required to build the staircase? A) 2570 bricks
B) 1400 bricks
C) 2860 bricks
D) 1430 bricks

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin