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RoseWind [281]
3 years ago
5

The ratio of ages (in years) of three children is 2:4:5. The sum of their ages is 33. What is the ages of each child ?

Mathematics
2 answers:
emmasim [6.3K]3 years ago
7 0
2+4+5 is 11 and 33/11 is 3 so for every 1 is 3 years,
 the first is 2 so is 2x3=6
the second is 4 so is 4x3=12
the third is 5 so is 5x3=15
SpyIntel [72]3 years ago
7 0
You could also write it as:
1st child's age:= 2x
2nd child:= 4x
3rd child:= 5x
2x+4x+5x=33
11x=33
x=3
Then
1st child's age:= 2x= 6
2nd child:= 4x= 12
<span>3rd child:= 5x= 15
</span>To check if it's correct you need to sum up: 6+12+15=33
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The <em>trigonometric</em> function that represents the curve seen in the picture is f(x) = 4.5 · sin (π · x / 2 - π) - 6.5.

<h3>How to derive a sinusoidal expression</h3>

In this problem we need to find a <em>sinusoidal</em> expression that models the curve seen in the picture. The most typical <em>sinusoidal</em> model is described below:

f(x) = a · sin (b · x + c) + d    (1)

Where:

  • a - Amplitude
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  • c - Angular phase
  • d - Vertical midpoint

Now we proceed to find the value of each variable:

Amplitude

a = - 2 - (-6.5)

a = 4.5

Angular frequency

b = 2π / T, where T is the period.

0.25 · T = 4 - 3

T = 4

b = 2π / 4

b = π / 2

Midpoint

d = - 6.5

Angular phase

- 2 = 4.5 · sin (π · 4/2 + c) - 6.5

4.5 = 4.5 · sin (π · 4/2 + c)

1 = sin (2π + c)

π = 2π + c

c = - π

The <em>trigonometric</em> function that represents the curve seen in the picture is f(x) = 4.5 · sin (π · x / 2 - π) - 6.5.

To learn more on trigonometric functions: brainly.com/question/15706158

#SPJ1

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