Use a proportion to solve each problem ? To make a model of the Guadeloupe river bed hermie used 1 inch of clay for 5 miles of the rivers actual length. His model river was 50 inches long. How long is the Guadeloupe river?

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.