[15-0] would be a numerical expression for this. :P
Answer:
Jacklyn is wrong because

Step-by-step explanation:
We have that :Jaclyn estimates that the square root of 50 in the following way:



Jacklyn is wrong because she made an error at

The correct expression is

This gives:


For the solid line it is (0,-3), (0,3), (-3,4)
for the dotted line it is (-1,-1), (-3,-2), (-3,2)
hope this helps don't know for sure though if its right i just did the best i could do.