Which of these sets of angle measures could be three angles in a triangle
a) 40° , 50°, 60°
b) 50°, 60°,70°
c) 60°, 70°, 80°
d) 70°, 80°,90°

Which system of linear inequalities is represented by the graph? !

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Urgent? will give brainliest to the first correct answer what is the area of the figure?