Washing his dad's car alone, Ken takes 6.5 hours. If his dad helps him, then it takes 6 hours. How long does it take Ken's dad to wash the car by himself?

On a piece of paper graph f(x)=5•(0.4)^x

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

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3