Use C ++ and Please use roots, draw the tangent line to find the resistivity which is the unknown.

Project: Average resistance A student wants to measure a resistivity of a material of certain wire of radius 2 mm, and length of 25 cm. He got the following data Voltage (V): 100, 90, 80, 70, 60, 50, 40, 30, 20, 7 Current (A): 11, 8, 7, 6, 5.7,5, 3.9, 2.3, 2.1, 1.1 Find the Pavg