Find the tip amount on a $20 lunch if you leave 20% tip

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

An episode of a television show is 60 minutes long when it originally airs with commercials. on a dvd without commercials, the episode is only 417 minutes long. how many1-minute commercials did the episode include when it originally aired? write and solve an equation to justify your answer.

There is an entrance to the computer room at point e which lies on ab and is 5 feet from point a. plot point e on the coordinate plane. find the distance from the entrance at point e to the printer at point e