Is it ok to have freinds if so can I have some guy friends

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?

A+b= 17, ab=70, find the value of |a-b|