Four brothers (andrew, brad, carl, and david) leave their parents' house at the same time and take the highway to their respective homes. the graph shows how long andrew, brad and carl drove and how far each had to travel on his highway to reach his home.
david drove 1.75 hours.
the distance he drove can be modeled by the equation d=40t where d = distance and t = time.
which brother traveled at the greatest speed?
a. andrew
b. brad
c. carl
d. david

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