Answer:
 α= 1.3 10-5 ºC⁻¹
Step-by-step explanation:
La dilatación termica de los cuerpos esta dada por la relación 
 ΔL = L₀ α ( T -T₀) 
en este caso nos piden el coeficiente de dilatación térmica 
 α =DL/L₀ DT 
 
calculemos 
 α = ( 100,13 -100)/[100 (100 – 0)] 
 α = 1,3 10-5 ºC⁻¹
Traduction
The thermal expansion of bodies is given by the relationship 
 ΔL = L₀ α (T -T₀)
 
in this case they ask us for the coefficient of thermal expansion 
 α = ΔL / L₀ ΔT 
 
 let's calculate 
 α = (100,13 -100) / [100 (100 - 0)] 
 α= 1.3 10-5 ºC⁻¹