Which table shows a nonlinear relationship

This week, conrad will work 1 3/4 times longer than last week. giovanni will work 1 1/3 times longer than last week. sally will work 2/3 the number of hours she worked last week. match each employee's name to the number of hours he or she will work this week

The area of a circle is equal to 1 dm². find the radius of the circle.

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?