An urn contains 7 white and 5 red balls. Six balls are randomly drawn from the urn in succession, with replacement. That is, after each draw, the selected ball Is returned to the urn. What is the probability that all 6 balls drawn from the urn are white? Round your answer to three decimal places.

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.