Answer:
12 months
Step-by-step explanation:
Answer: 12 Months
Answer:bb
y=7
x+y=12
x=5
12-5=7
16
Start by adding 9 to both sides, obtaining: √(x + 9) = 5.
Square both sides, obtaining: x + 9 = 25.
Subtract 9 from both sides: x = 16
Note that √(16+9) - 9 = -4, as required.