An employee at a company collects and analyzes data to estimate the cost, y, of shipping packages Weigmy JU represent the data when x > 0.
Which best describes the value 0.25?
slope and the cost of shipping per ounce
slope and the initial cost of shipping an item
y-intercept and the cost of shipping per ounce
y-intercept and the initial cost of shipping an item
Lanza, Homer O, +2

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.