Please help me. i will give brainliest. The table shows the relationship between the diameter in kilometers of an oil spill and the time in days. A quadratic function can be used to model this relationship.

What is the best prediction of the time required for the oil spill to reach the diameter of 10 km?

A) 147 days

B) 200 days

C) 205 days

D) 233 days

Answer is D

First we need to Re-write them in slope-intercept form and than compare slopes of both lines.
You can tell that 2 lines are perpendicular if their slopes have relation:
k1 = -1/k2
where k1 is slope of first line and k2 is slope of second line.

Standard formula for line is:
ax + by = c

we transform that in this form:
y = kx + m where k is slope and m is intercept.