Keeping in mind that an hour is 60 minutes.
Luis's cell phone plan costs $39 per month. Text messages cost an additional $0.15 each. If Luis's cell phone bill last month to
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The midpoint of the line having the endpoints 
and 
is 
basically average them
so given that the line has the endpoints of (-3,7) and (9,-2)
x₁=-3
y₁=7
x₂=9
y₂=-2
so the midpoint can be found by doing
the midpoint is
basically average them
so given that the line has the endpoints of (-3,7) and (9,-2)
x₁=-3
y₁=7
x₂=9
y₂=-2
so the midpoint can be found by doing
the midpoint is