Hi everyone! I've got the following problem that I can't solve... Grateful for any help!

A great circle C occurs when the sphere x^2+y^2+z^2=1 and the plane x+y+z=0 intersect.

A) express the equations for the great circle C using spherical coordinates

B) express the equations for the great circle C using cylindrical coordinates

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.