The latitude value of toronto is 43.70 degrees, and the longitude value is 79.40 degrees. the latitude value of melbourne is -37.81 degrees, and the longitude value is 144.96 degrees. the two cities are degrees apart in latitude. the two cities are degrees apart in longitude.

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.