One month, Ruby worked 6 hours more than Bobby, and Greg worked 4 times as many hours as Ruby. Together they worked 126 hours. Find the number of hours each person worked.

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Don't know how to find x given these segment lengths