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zhannawk [14.2K]
3 years ago
15

Two less than the sum of a number and six is equal to the product of

Mathematics
1 answer:
stiks02 [169]3 years ago
8 0

Let's use the variable, x, to represent the unknown number.

We can represent the words, "the sum of a number and six, as : x + 6

The words, " 2 less than the sum", can be represented as: x + 6 - 2

The words, "the product of the number and three", can be written as: 3x

Now create an equation using "is equal to" to join the expressions:

x + 6 -2 = 3x

Now combine like terms and use inverse operations to solve for x:

x + 6 -2 = 3x

x + 4 = 3x

x + 4 - x = 3x - x

4 = 2x

4/2 = 2x/2

2 = x

The unknown number is 2

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The sinusoidal function that models the situation is:

y = 4.5\sin{\left(\frac{\pi}{12}\right)x} + 5

From the function, we have that:

  • The amplitude is of 4.5 ft.
  • The mid-line equation is of y = 5.

<h3>What is a sinusoidal function?</h3>

A sinusoidal function is a trigonometric function, and has the following format, considering no phase shift:

y = A\sin{(Bx)} + C

In which:

  • A is the amplitude, which is the twice the difference between the largest and smallest value.
  • The period is of \frac{2\pi}{B}.
  • C is the vertical shift, and the mid-line equation is y = C.

In this problem, the high is of 9.5 ft and the low is of 0.5 ft, hence, for the amplitude, we have that:

2A = 9

A = \frac{9}{2}

A = 4.5

With an amplitude of 4.5, the standard function would vary between -4.5 ft and 4.5 ft, while in this problem the variation is from 0.5 ft to 9.5 ft, hence the vertical shift is of:

C = 9.5 - 4.5 = 4.5 - (-0.5) = 5

Which means that the mid-line equation is of y = 5.

Period of 24 hours, hence:

\frac{2\pi}{B} = 24

24B = 2\pi

B = \frac{\pi}{12}

Hence, the function is:

y = 4.5\sin{\left(\frac{\pi}{12}\right)}x + 5

You can learn more about sinusoidal functions at brainly.com/question/26384970

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