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NeX [460]
2 years ago
11

At summer camp the ratio of boys to girls was 7:2 If there were 21 boys how many girls were there?

Mathematics
1 answer:
Alenkinab [10]2 years ago
3 0
Ratio:\\7:2\\\\
7x-number\ of\ boys\\2x-number\ of\ boys\\\\
7x=21\ \ \ |:7\\
x=3\\\\
2x=2*3=6\\
Number\ of\ girls\ is\ equal\ to\ 6.
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igomit [66]
The energy of a photon is given by
E = h × v

where:
E is the energy in joules/photon
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Substitute 'h' and 'v' into the formula we have

E = (6.63×10⁻³⁴) × (7.55×10¹⁴)
E = (6.63×7.55) × (10⁻³⁴ × 10¹⁴)
E = 50.0565 × 10⁽⁻³⁴⁺¹⁴⁾
E = 50 × 10⁻²⁰ joules/photon
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3 years ago
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laiz [17]

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8 0
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MissTica

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Step-by-step explanation:

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