A company has 3835 employees. Each employee is to be given an ID number that consists of one capital letter followed by 1 digits. How many different ID numbers are possible?

Identify the number as a rational or irrational.explain. 127

This is about circle theorems. someone asap : (

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.