Afreight train travels at 30 mph. if the freight train is 300 miles ahead of an express train traveling at 55 mph, how long will the express train take to overtake the freight train?
if x represents the distance the train traveling 30 mph travels, then the train traveling 55 mph travels
x miles
x + 300 miles
x - 300 miles

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle