Thx guys

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1x10⁻¹m

Step-by-step explanation:

y = 3x10⁸/x

x is wavelength

y is frequency

what is the wavelength if frequency is 3 x10⁹= y

y = 3x10⁸/x

3 x10⁹ = 3 x10⁸/x

make x the subject of formula

3 x10⁹x  = 3 x10⁸

divide both sides by 3 x10⁹

x = 3 x10⁸/3 x10⁹

Adopting law of indices

xᵃ/xᵇ = xᵃ⁻ᵇ

3¹⁻¹x10⁸⁻⁹ = 3⁰x10⁻¹ = 1x10⁻¹m

just get this app called photo math it should be able to do those

2: 10

step-by-step explanation: