Which statements are true about the value of the digits in the number 5,555,555? choose all answers that are correct. a. the digit in the thousands place is 1/5 the value of the digit in the ten thousands place. b. the digit in the hundred thousands place is 1/10 the value of the digit in the millions place. c. the digit in the ten thousands place is 10 times the value of the digit in the thousands place. d. the digit in the hundreds place is 50 times the value of the digit in the tens place.

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.