Answer:
A.

Explanation:
Equation of the situation in slope-intercept form is given as
,
Where:
y = height of the balloon in the air (feet)
x = time (secs)
m = rate at which the balloon is heading towards the ground = -3
b = y-intercept, which is the starting value = 500
Substitute m = -3, and b = 500 into

The equation would be:
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