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torisob [31]
3 years ago
10

Radiation​ machines, used to treat​ tumors, produce an intensity of radiation that varies inversely as the square of the distanc

e from the machine. At 3​ meters, the radiation intensity is 62.5 milliroentgens per hour. What is the intensity at a distance of 2.7 ​meters?The intensity is______milliroentgens per hour. (Round to the nearest tenth as needed.)
Mathematics
1 answer:
iren [92.7K]3 years ago
4 0

Answer:

77.2 milliroentgens per hour

Step-by-step explanation:

The first step is to find the constant of proportionality

I ∝ 1/d²

I = k/d²

62.5 = k/(3)²

k = 562.5

The second step is to calculate the intensity at 2.7 meters:

I = 562.5/d²

I = 562.5/(2.7)²

I = 77.2 milliroentgens per hour

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Pamela is 7 years younger than Jiri. The sum of their ages is 39. What is Jiri ‘s age?
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Based on the task given, Pamela's age and juri's age is 16 and 23 years respectively.

<h3>Equation</h3>

  • Juri's age = x
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x + (x - 7) = 39

x + x - 7 = 39

2x = 39 + 7

2x = 46

x = 46/2

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Juri's age = x

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