Can someone me with this question ?

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height