Given the sets
u = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
a = {0, 1, 4, 7, 9}, and b = {0, 4, 5, 6, 7}, use de morgan's laws to find the indicated set. (enter your answers as a comma-separated list. enter empty for the empty set.)
(a' ∩ b)'

What is the difference between the equations of a vertical and a horizontal line?

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 =

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.