How to calculate a riemann sum that does not include zero.

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path