Which equation represents the line that passes through the points(-4, -1) and (-1, -7)?
y = -2x -9
y = -2x +9
y = -1/2x + 3
y = -1/2x - 3

Take [down] as the positive direction. 

h = vt + 1/2 g t^2 

v is initial vertical speed 
g is acceleration due to gravity 

h = 15.0 m/s (2.00 s) + 1/2 (9.80 m/s^2 )(4 s^2) 
h = 30.0 m + 19.6 m 
h = 49.6 m 

The bridge is 49.6 m above the water.

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