Can someone me with this problem

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?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Use complete sentences to differentiate between a regular tessellation, and a pure tessellation. be sure to include specific types of polygons in your explanation.