There are 9 one-digit numbers (1 to 9), 90 two-digit numbers (10 to 99). how many three-digit, four-digit, etc., numbers are there? the first 9 terms of the harmonic series 1 + 1 2 + 1 3 + ···+ 1 9 are all greater than 1 10; similarly consider the next 90 terms, and so

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.

Precalculus question, image attached.