What is the area a perimeter of the figure

Find the pattern and use it to list the nth term in the sequence. 6, 12, 20, 30, 42, 56, the nth term of the sequence is

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges