I assume you mean 4 X 10^-17 Joules.
Energy = Planck's constant * speed of light/wavelength in meters
4 X 10^-17 Joules = (6.626 X 10^-34 J*s)(2.998 X 10^8 m/s)/wavelength
wavelength in meters = (6.626 X 10^-34)(2.998 X 10^8)/(4 X 10^-17)
= 4.9662 X 10^-9 meters
or
4.97 nanometers
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4.9695 nm
(17-4)+10=23 13+10=23
a - 3 + 17 = 10 Therefore, a - 3 = -7 a = -4
8/17 ÷ 4/5 = 40/68 which can be simplfied to 10/17.
40 x 170 = 4 x 10 x 17 x 10 which equals 4 x 17 x 10 x 10 which becomes 4 x 17 x 100 = 68 x 100 = 6800 Or, you can multiply 4x17, then put two zeroes on the end.