4. un litro (l) de pintura cubre aproximadamente 10m2 de pared. ¿qué anchura tendrá la capa de pintura depositada sobre la pared antes de secarse? (sugerencia: 1 l = 1 x 106 mm3).

The question is the width of the layer of paint before it dries.

You can use the formula for the volumen, V = area * width => width = V / area

Where V = 1 liter = 1 m^3 /1000 = 10^ -3 m^3 and area = 10m^2

Then the width of the layer will be: width = [10^ - 3 m^3 ] / [10m^2] = 10^-5 m

Now convert to mm : 1 m = 10^3 mm

=> 10^-5m * 10^3 mm/m = 10^-2mm = 0.01mm

0.01 mm

Ithink if im not mistaking b is -3 but im not a 100% sude