TWO QUESTIONS IN PP3

1．  For any positive integer n, the length of n is defined as the number of prime factors whose product is n, for example the length of 75 is 3, since 75=3*5*5. How many two-digit positive integers have length 6?

Answer is 2. Why?

2. What is the result when x is rounded to the nearest hundredth?

(1)when x is rounded to the nearest thousandth the result is 0.455

(2) the thousands digit of x is 5.

A B C D E