Which property is shown? 2.3 + (-1.2 + 9.6) = (2.3+ (-1.2)) + 9.6

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

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?

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?