Yes, you can add a negative and a positive when doing like terms.
Answer:
59.0 miles per hour
Step-by-step explanation:
When you have an equation with an absolute value, you must consider two options: one with a positive result and another one with a negative result.

In this case you need the maximum safe driving speed which is 59.2 miles per hour
11*57+X(1+2+3+.....+56)
=11*57+X(1+56)*56/2
=627+1596X
=19779
X=(19779-627)/1596=12
Your answer is C
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Hope this helps. I know it because I'm in your class</span>
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