Hey there,
Your correct answer would be "wavelength". That indicates how long the wave's are. There is a illustration below to explain.
A.) would be your correct answer.
Hope this helps.
~Jurgen
Here you go!! Let me know if you have questions.
210000 * .20 = 42000 down payment
210000 * .04 = 8400 closing costs
197040.76 + 42000 + 8400 = 247440.76 total cost
V=πr2h
v=π(5)^2(10)
v=250π
v=785 inches cubed