If you are paying that teacher, stop it. Honestly, I have difficulty believing you. You absotely need to master scientific notation, it does not take a rocket scientist to master it.
1000=1*103=1E3 (more often, a little e is used)
Now your problem (all done in ScientificNotation)
the wave equation; frequency*wavelength=speed of light
frequency=speedlight/wavelength=(3e8 m/s )/(2.5e-9 m)
now you have to remember, the rules for exponents
3e8/2.5e-9=(3/2.5 ) e^17 Hz=1.2e^17 hertz
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