Please help me please thank you sm in advance

Two numbers have a sum of -19. one number is x. what expression represents the other number?

1) your friend taylor missed class today and needs some identifying solutions of systems. explain to taylor where to find the solution(s) of any system using its graph 2)taylor graphs the following in desmos and decides that f(x) = g(x) at x = 0, x = 1, & x = 3. f(x) = 2x+1g(x) = 2x2+1 provide taylor some feedback that explains which part of the answer was incorrect and why.

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.