Write them expended number in normal form (1x10)+(2×1)+(4×0.1)+(5×0.01)

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.

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

Ill mark the brainliest if you me with the these three questions 7,8,9