HELP BRO I HAVENT BEEN PAYING ATTENTION AND IM CONFUSED

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

For each proportion find the unknown number x 1/5/8=×/15

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?