Special right triangles- how do I get the answers ?

Dee used 2 1/3 cups of sugar for a cake recipe. if the amount of sugar the container holds is 3 times the amount she used, does the container hold more than, less than, or equal to 3 cups of sugar? explain.

Which of the following expressions is equal to 2x^2+8

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16