The cashier at the merchandise shop estimates that the most popular design of t-shirt will make £300 when rounded to the nearest hundred. Before the event they sell £89.80 worth of the t-shirt design, £30.65 during the concert and £180.50 after the event. Is the cashier’s estimate correct?

Need solving this second acceleration problem.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Pls yall i really need the answer fr fr