O Amy pays interest each months on a loan of £4000. After 3 months she has paid a
total of £27 interest. Work out the monthly
rate of interest.

I’m confused on how to work the pie charts

Ineed to know how to write question one in mathematical terms

Awavelength of 610 nm was found to be the most intense wavelength emitted by copper. answer the following questions about this wavelength of light. a) what is this wavelength in cm? b) what is the frequency that corresponds to this wavelength? c) what is the energy of light of this wavelength? d) what is the wavenumber corresponding to this wavelength?