Answer:
$1
Step-by-step explanation:
Let's call the ringtone r. If the ringtone and $3 equals $4, then we can write the equation $4=$3+r. To solve, all you have to do is isolate the r by subtracting 3 on each side.
I had this answer
Answer: 1
3(x-1)
3 times x = 3x
3 times -1 = -3
3x-3
1
