A circle has a diameter of 20 m. What is the circumference

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Sum of the interior angles of a pentagon

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?