Help Please

15/16 as a decimal rounded to the nearest hundredth

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe