Because the expenses are greater than the income.
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On a graph of acceleration vs. time, during deceleration the line is below zero. On a graph of speed vs. time, during deceleration the line has a negative slope (sloping downward from left to right).
The length of the downward sloping side of the ramp would be 18 feet approximately this is pythagarus theorem of the sum of squares. the answer should in fact be the number corresponding to the square root of (10*10+15*15).
18 feet
Sloping upward (from bottom left to top right).
-- Any number less than -5 is a steeper line sloping down. -- Any number greater than +5 is a steeper line sloping up.