What equation is used to solve for an interior angle of a triangle?
A.) a+b+c= 360
B.) a + b = 90
C.) a+b+c=180
D.) a + b = 180

Give me the equations of two lines that have the same slope but are not parallel.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?