Write a division problem whose quotient has its first digit in the hundreds place

Write a division equation you could use to find a, the number of miles ava is in charge of. what is the value of a? write your answer is simplist form

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

What is the answer to the question 5x+2x