Find the surface area of the regular pyramid.

___cm^2

Find the simple interest earned to the nearest cent for each principal,interest rate,and time 735 7% and two and a half years

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?