M = ( (-6+4)/2, (3+-2)/2 )
M = (-1, 1/2)
The third one because each banner costs $16 and x is the number of banners, $32 is just a one time fee so there is no x.
Step-by-step explanation:

While subtracting , the sign of each term of second expression changes & remove the parentheses.
⟶ 
Combine like terms. Like terms are those which have the same base. Only coefficients of like terms can be added or subtracted.
⟶ 
⟶ 
In standard from , the expression should be written in such a way that the power of variables goes from highest to lowest.

Hope I helped ! ♡
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Answer:
155answer.
Step-by-step explanation:
25 is 80 and thaths why its 157
F(x) = 5x
for f(7) you replace x with 7 so it will be : f(7) = 5(7) = 35