Rui Feng is x years old. In 4 years’ time, his brother will be 3 times as old as him.
Find the age of Rui Feng’s brother in 4 years’ time.
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Step-by-step explanation:
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- Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye.
- Visible light is usually defined as having wavelengths in the range of 400–700 nanometers (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).
- This wavelength means a frequency range of roughly 430–750 terahertz (THz).
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