19
10 - (-9) = 19
18
When you add -9 and +10, you get (+) 1.
19
add 9 plus 5 than subtract 1 from 5 to add it to 9 will give you 10
The answer for 9 more than 10 is 19. You simply add 9 to 10, which gives you 19.
19
-1
10
The two numbers that multiply to 90 and add to 1 are 10 and -9. When multiplied, 10 * -9 equals -90, and when added, 10 + (-9) equals 1.
you add 9 and 10. then you get 19 you divide by 2 and that's how you get your answer.=)
If you add 9+10 you would got 19