are the lines in the diagram perpendicular, parallel, skew, or none of these?

How is working backward similar to solving an equation?

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible