4. The three angles of a triangle measure x°, y° and 39°. Which of the following statements must be true? A. y=x+39
b. y+x=180-39
C. x+y=39
D. y=180-x

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Which expression is equivalent to -5(3x - 6/7)