Express the cartesian coordinates ( - 5,5) in polar coordinates in at least two different ways. write the point in polar coordinates with an angle in the range 0 < = theta < 2pi (type an ordered pair. type an exact answer, using pi as needed.) write the point in polar coordinates with an angle in the range - 2pi < = theta < 0. [ ] (type an ordered pair. type an exact answer. using pi as needed.)

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.