24 because when y = -12 then you have to solve this equation y = -1/4x - 6. Then you need to add 6 to -12 to get -6, then you need to divide -6 by -1/4 and with that you get 24.
Answer:
The age of the youngest friend is 9 years old.
Step-by-step explanation:
3a = 30 - 3
= 27 ÷ 3
= 9
= 9 + 10 + 11 = 30
= 9 is the smallest number. So, the youngest friend is 9 years old.
