Which numerical pattern is nonlinear?​

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?