Which proportion can be used to solve the following problem? It takes Mark 20 minutes to type and spell-check 14 pages of a manuscript. Find how many pages he can type and spell check-in 5.5 hours.

HINT: Watch out for inconsistent units of measure!
A. 20/14 = 330/x
B. 14/20 =5.5/x
C. 20/14 = 5.5/x
D. 330/14 = 20/x

The triangles are similar. what is the value of x? enter your answer in the box.

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?

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.