There are 5 people in the Brass Ensemble, and
each person plays a different instrument. All of the
musicians want to play a piece with someone who
plays a different instrument. The instruments are
Trombone, Cornet, Sousaphone, French Horn
and Tuba. Which list contains all the instrument
combinations?

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.