Combine these radicals.
-3V81 +16
--23
|--11
-397
-313

Question and answers are in the attached picture. you so much in advance.

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?