The table below illustrates the decay of a sample of radioactive uranium. time in days, x 0 1 2 3 4 5 sample remaining (grams), u 500 255 130 66 34 17 which equation best models this set of data where u represents the amount of sample remaining, in grams, at time x?

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.

Three friends are comparing the prices of various packages of golf balls at a sporting goods store. hector finds a package of 6 golf balls that costs $4.50.

What is the interquartile range (iqr) of the data set represented by this box plot?