19
The numbers that multiply to make 84 and add to make 5 are 12 and -7. When you multiply 12 by -7, you get 84, and when you add them together, 12 + (-7) equals 5. Thus, the solution is 12 and -7.
+12
2
It is: (15-7)*(12-9) = 24
7 x 5 = 35 7 + 5 = 12
7 add 7 add 7 then you take away 12
To get 1, you need 12 twelfths. If you have 7/12 you have to add 5/12 to get to 12/12 = 1(7 + 5 = 12, 7/12 + 5/12 = 12/12 = 1)
+12
5 and 7 are both prime numbers that add up to 12
2
It is: 10
7/12
30
five twelfths 7/12 + 5/12 = (7 + 5)/12 = 12/12 = 1/1 = 1
19
19
It is: (15-7)*(12-9) = 24