Quick and explain. i'm offering 25pts and brainliest answer

A. Subtract the difference between the two columns for two sets of numbers:

30-20 = 10

135 -110 = 25

40-30 = 10

160 - 135 = 25

So for every 10 t-shirts the total cost raises by 25

25 / 10 = 2.50 per t-shirt.

The starting cost is when 0 t shirts are sold.

110 - 50 = 60

The equation would be C = 2.50n + 60

( Multiply 2.50 by the number of t-shirts sold and then add the starting cost of 60).

B. See attached picture.

C. Using the equation from A replace n with 120:

C = 2.50(120) +60

C = 300 + 60

C = 360

It would cost $360.00

no pictures of the graph