Find the spherical equivalent of the following Rs's:
 
 

1.  +3.50 2.  -1.00 -1.00 x180 3.  +0.50 -2.00 x030 4.  -1.00 +1.00 x080 5.  -1.00 +3.00 x110 6.  +8.75 -2.25 x005 7.  -16.75 -2.00 x179 8.  -16.75 +2.00 x005         9.  -0.75 +1.00 x092 10.  -1.62 +1.75 x115 11.  +0.25 -0.50 x135 12.  pl -0.50 x058 13.  -4.25 14.  pl +3.75 x053 15.  +0.25 -0.50 x145 16.  +0.25 -0.25 x135 17.  +22.50 -3.50 x058 18.  -0.25 -0.50 x033 19.  +1.00 -2.00 x090

The answers are here.  Please do them yourself before you go to the answers.  If you understand it all and you don't need the practice then it will only take you a few minutes to do them.  If you are struggling with the formulas do one or two, check them, do a few more, check them, . . . just make sure that you do not look ahead of the ones that you did and are checking.