Answer d because the y intercept is 3 and its a positive slope
It is basically : 0.600 + 0.03 + 0.002
12 A . my guess would be to divide 2175 by 18 which would give you 120.83
He has 2/3 left to complete.
He did 5 out of 15 which is 5/15 or 1/3. Therefore he has 1-1/3 or 2/3 left.
Their error is that they divided 12 by 30, instead of 30 by 12 in order to get the price per pair
the correct unit price is $2.50 per pair
2.5 * 12 = 30