Find cost if tanx= negative 2sqrt of 2 all over 2 and sinx = sort of 6 over 3

The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.

Which of the following can scientists estimate geologic time? a.observing rock sequences b.radiometric dating c.comparing fossils d.all of these

What factors britain to become an industrial and commercial power?