Find the values of the variables.
[-12 -w^2] = [2k -81]
[2f 3 ] [-14 3.]
show all steps used to solve this problem willing to give 35 points if answered correctly !

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