can someone please help me with c and d

Answer:
c. x > 6
d. λ = 3/100
Step-by-step explanation:
c. You have the idea for the necessary equation:
speed = wavelength·frequency
[tex]10^y=10^{-3}\cdot 10^x \qquad\text{substitute given values}\\\\y=x-3 \qquad\text{take logs, or equate exponents}\\\\x-3>3 \qquad\text{substitute into the y inequality}\\\\x>6 \qquad\text{add 3}[/tex]
The inequality is x > 6.
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d. If λ represents the wavelength in nanometers, the range restriction can be written ...
2/100 < λ < 5/100
A possible value of λ is 3/100.