Review the table showing the mass of a radioactive isotope over time. Which function best models this data?

y = 11.97(0.93)x

y = –0.42x + 10.75

y = 13.15 – 3.17 ln x

y = 0.01x2 – 0.72x + 11.82

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

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?