Posted by **bob HELP NEEDED HELP NEEDED HELP NEEDED** on Sunday, May 1, 2011 at 7:08pm.

a bootlenose dolphin jumps out of the water. the path the dolphin travels can be modeled by h=-0.2d^2+2d, where h represents the height of the dolphin in feet and d represents the horizontal distance.

What is the maximum height the dolphin can jump?

- math -
**MathMate**, Sunday, May 1, 2011 at 8:17pm
h(d)=-0.2d^2+2d

To find the maximum (or minimum), we find the derivative with respect to d and equate to zero.

h'(d) = -0.4d+2 = 0

=>

d = 2/0.4 = 5 ft.

Check that this is the maximum:

method 1:

a parabola with a negative coefficient has only one maximum and no minimum.

method 2:

check sign of h"(d) where d=5'

h"(d) = -0.4 <0 => maximum.

## Answer this Question

## Related Questions

- math - a bootlenose dolphin jumps out of the water. the path the dolphin travels...
- math - a bootlenose dolphin jumps out of the water. the path the dolphin travels...
- physics - A trained dolphin leaps from the water with an initial speed of 12 m/s...
- Math Geometry - Please check my answers! - There's a line graph with 3 dolphins...
- physics - A dolphin experiences a force of 320 N [up] when it jumps out of the ...
- Physic - A dolphin experiences a force of 320 N [up] when it jumps out of the ...
- math - A dolphin is swimming with her friend. The dolphin jumps to a height of 4...
- Physics - A dolphin jumps with an initial velocity of 13.0at an angle of 44.0 ...
- Physics - A dolphin jumps with an initial velocity of 13.0at an angle of 44.0 ...
- physic - A dolphin jumps with an initial velocity of 13.0m/s at an angle of 41.0...

More Related Questions