My friend needs help finishing this but she isn’t sure what to do..can anyone help please?

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Mila's dog weighs 4 pounds more than 8 times the weight of keiko's dog. which expression could be used to fine te weight of mila's dog?