What two lines intersect at a right angle

Find the balance at the end of 4 years if 1000 is deposited at the rate of

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

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?