The residual is the difference between the plotted point and the line of best fit.
We first need to know the point at x=5 for the line of best fit.
y1 = -(5) - 3 = -8
Now we need to find the difference between the line of best fit and the plotted point.
residual = 9 -(-8) = 9 + 8 = 17 or C
50% off means half price, so half of 49.98 is 24.99
the necklace now costs 24.99 dollars
Answer: D
Step-by-step explanation: