Mikayla worked the same number of hours each day for 4 days during one week. She worked less than 20 hours total for that week. Which graph represents the number of hours per day she could have worked? (Assume the number of hours is greater than 0.) A number line going from 0 to 10. An open circle is at 5. Everything to the left of the circle is shaded. A number line going from 0 to 10. An open circle is at 5. Everything to the right of the circle is shaded. A number line going from 11 to 21. An open circle is at 16. Everything to the left of the circle is shaded. A number line going from 11 to 21. An open circle is at 16. Everything to the right of the circle is shaded.​