Rolf spent 15 hours last week practicing his saxophone. if 3/10 of the time was spent practicing warm-up routines, how much time did he spend practicing warm-up routines?

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