Question

A firecracker shoots up from a hill 140 feet high with an initial speed of 100 feet per second. Using the formula H(t) = -16t^2 + vt + s, approximately how long will it take the firecracker to hit the ground?

Five seconds

Seven seconds

Nine seconds

11 seconds

Answer 1

Please help me I only have 4 questions left

Answer 2

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Answer 3

sorry can't help don't remember how to use the formula anymore been little long that I did geometry.

Answer 4

The function f(x) = -x^2 - 5x + 50 shows the relationship between the vertical distance of a diver from a pool's surface f(x), in feet, and the horizontal distance x, in feet, of a diver from the diving board. What is a zero of f(x) and what does it represent?

x = 5; the diver jumps in the pool at 5 feet per second

x = 10; the diver jumps in the pool at 10 feet per second

x = 10; the diver hits the water 10 feet horizontally from the board

x = 5; the diver hits the water 5 feet away horizontally from the board