Segment BD is a midsegment of triangle AEC Which equation could be used to find the value of x? 39x -11 = 17x + 6

39x - 11 = 2(17x + 6)

2(39x - 11) = 17x + 6

2(39x - 11) = 2(17x + 6)

Find the value of the cosine for angle a

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Plz.yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?