What is 109 percent as a decimal?

Does anyone know how to do geometryme with this problem

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =