Answer:
7, 14, 21
3, 6, 9, 12, 15, 18, 21
Every 21 days she have both on the same day.
Taking logarithms, you get

It is a reflection across the y axis, then a translation to the right 2 units.
I hope this helps! If you have more you want help with I can help.
Answer:
y=4x-10
Step-by-step explanation:
See attached image