Eric starts with 10 milligrams of a radioactive substance. The amount of the substance decreases by each week for a number of weeks, w. He writes the expression
100%)" to find the amount of radioactive substance remaining after w weeks.
Andrea starts with 1 milligram of a radioactive substance. The amount of the substance
decreases by 20% each week for a number of weeks, w. She writes the expression
(1 – 0.2)" to find the amount of radioactive substance remaining after w weeks.
Use the drop-down menus to explain what each part of Eric's and Andrea's
expressions mean.

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

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

Finally, the arena decides to offer advertising space on the jerseys of the arena’s own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14. what is this as a percentage and a fraction? what is the probability of not being shortlisted? give your answer as a decimal. those shortlisted are entered into a final game of chance. there are six balls in a bag (2 blue balls, 2 green balls and 2 golden balls). to win, a company needs to take out two golden balls. the first ball is not replaced. what is the probability of any company winning advertising space on their volley ball team jerseys?