Um i need help sike just kidding this is just for fun get points 9+100

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a