Find the digit 5 in each of these numbers.
15.2
3.5
the 5 in 3.5 is 1 place to the right of the 5 in 15.2
which sentence correctly compares the values?
a. the value of the 5 in 3.5 is 1/100 times the value of the 5 in 15.2
b. the value of the 5 in 3.5 is 1/10 times the value of the 5 in 15.2
c. the value of the 5 in 3.5 is 10 times the value of the 5 in 15.2
d. the value of the 5 in 3.5 is 100 times the value if the 5 in 15.2

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.