Let b=height of building. By similar triangles we can say:
b/44.75=3.1/1.29
b=44.75*3.1/1.29
b≈107.54
b≈108 meters (to the nearest whole meter)
You can either write 2.4 as 12/5 ( an improper fraction) or as 2(2/5) (a mixed number).
Se nos dice que Lucía corre 4 millas diarias. Ya que no corre los días domingo, entonces corre 6 días por semana, por lo tanto:

Por lo tanto, Lucía corre 24 millas por semana.
Step 3 is wrong ( = 1/10 pound x 1/10 pound )