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Answer:
Approximately 0.51
Step-by-step explanation:
The formula of a slope:

We have the points (look at the picture) (0, 1) and (-2, -2). Substitute:

The function will be

where y is the balance, and x is the number of month.
The raph will be a line on the xy-plain which starts at the point (0, 360), and end in the point (72, 0).
Hope it helps.
False. Two supplementary add up to 180 degrees.