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## Homework Statement

Hi, i need some help with this question,

A string of length 60cm and diameter 0.80 mm is under tension 64 N. When plucked, it emits a frequency of 660Hz. What is the new frequency if the length is decreased to 40cm, the diameter decreased to 0.50mm and the tension increased to 100 N? Please explain, Thanks!

## Homework Equations

f1/f2 = L2/L1, f1/f2 = Square Root F1/ Square Root F2, f1/f2 = d2/d1

## The Attempt at a Solution

I can do it when one of the variables are decreased but i have no idea where to start when 3 variables are changing.