Replying to Help with accoustic physics homework please

alright so i am stuck on two questions and i have no idea how to solve them. so if people have a knowledge of this, help would be greatly appreciated

A complex waveform repeats itself every 1×101 ms (ms = millisecond). What is the fundamental frequency? Just enter the number without any units. (For you to think about: What are the first 4 harmonic frequencies including the fundamental?)

A saxophone is playing a steady note of freqency 825 Hz. The temperature in the room is 32 oC. At a given moment in time, the pressure at your eardrum is at a maximum. How far away from your ear is the next high pressure region in the air? (Find the answer in meters, but do not enter units.)