12 less than a number is equal to the product of 7 and that number. Convert into an equation and find the number?
Please explain it step by step

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Which expression is equal to (f+g)(x)?

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?