If the resistivity of this alloy is dependent only on

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Find the accurate answer of the following question

Question- At a certain temperature T₁, a (7.8671x10) mm rod of a copper alloy containing (3.2930x10) at% Ni has a resistivity of (2.76x10^-7) ? -m. For pure copper, the resistivity at 0°C is 1.58 x 10^-8 ?-m and the change in resistivity per degree increase in temperature is 6.50 x 10^-11 (? -m)/°C. The value of A for nickel in copper is 1.18 x 10^-6 ?-m.

Part 1- If the resistivity of this alloy is dependent only on thermal and impurity considerations, find the coefficient of thermal expansion of this alloy (in (deg C)^-1) if the rod increases in length by (1.8900x10^-1) mm when heated to (1.5075x10²) °C. As always, use scientific notation in the form X.YZ x 10ⁿ.

I need help to determine the coefficient of thermal expansion of alloy.