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Svetlanka [38]
3 years ago
8

Determine the common ratio and find the next three terms of the geometric sequence.

Mathematics
1 answer:
12345 [234]3 years ago
3 0

Answer:

  • a_{4} =0.875
  • a_5=-0.4375
  • a_6=0.21875

Step-by-step explanation:

As we know that a geometric sequence does have the common ratio whoch is defined as the ratio of a term to the preceding term.

This common ratio is normally denoted by the 'r'.

As the given sequence is

-7, 3.5, -1.75 ...

So,

r=\frac{3.5}{-7}=-0.5, r=-\frac{1.75}{3.5}=-0.5

To find the nth term of a geometric sequence we use the formula:

a_{n} =a_{1} r^{n-1}

where,

r is the common ratio and a_{1} being the first term.

So, the next three terms i.e. a_{4}, a_{5} and a_{6} can be obtained by substituting the values of n = 4, n = 5 and n = 6 respectively in a_{n} =a_{1} r^{n-1}.

As

a_{1} =-7

r=-0.5

a_{n} =a_{1} r^{n-1}

So,  a_{4}, a_{5} and a_{6} can be obtained by substituting the values of n = 4, n = 5 and n = 6 respectively in a_{n} =a_{1} r^{n-1} when a_{1} =-7 and r=-0.5.

a_{4} =a_{1} r^{4-1}

a_{4} =(-7) r^{3}

a_{4} =(-7) (-0.5)^{3}

a_{4} =0.875

a_{5} =a_{1} r^{5-1}

a_{5} =(-7) r^{4}

a_{5} =(-7) (-0.5)^{4}

a_5=-0.4375

a_{6} =a_{1} r^{6-1}

a_{6} =(-7) r^{5}

a_{6} =(-7) (-0.5)^{5}

a_6=0.21875

Therefore,

  • a_{4} =0.875
  • a_5=-0.4375
  • a_6=0.21875

Keywords: geometric sequence , common ratio

Learn more about geometric sequence from brainly.com/question/12652555

#learnwithBrainly

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Step-by-step explanation:

Given,

Initial consultation charges for Plan One = $36

Per session fee = $92

Let,

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Initial consultation charges for Plan Two = $86

Per session fee = $42

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For same cost;

O(x) = T(x)

92x+36=42x+86\\92x-42x=86-36\\50x=50

Dividing both sides by 50

\frac{50x}{50}=\frac{50}{50}\\x=1

Putting x=1 in T(x)

T(1)=42(1)+86\\T(1)=42+86\\T(1)=128\\

Putting x=1 in O(x)

O(x) = 92(1)+36\\O(x) = 92+36\\O(x) = 128

The cost will be same for one session. The cost will be $128.

Keywords: function, division

Learn more about functions at:

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5 0
3 years ago
What is -5 5/8 + 3 1/2
aksik [14]

Answer:

exact form: -17/8

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Step-by-step explanation:

cmon this is freaking addition

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A rectangle has a length that is 4 meters more than the width. The area of the rectangle is 117 square meters. Find the dimensio
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Answer:

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Step-by-step explanation:

If the length is 4 meter more than the width than that means whatever the width is you must add 4 to it, in this case the width is 9 so add 4 to it which equals 13. If the length matches your answer it is the correct choice.

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Answer

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Step by step explanation

Here we have to use the formula.

The symmetry of a parabola x = -b/2a

Now compare the given equation y = 3x^2 + 24x -1 with the general form y = ax^2 + bx + c and identify the value of "a" and "b"


Here a = 3 and b = 24. Now plug in these values in to the formula to find the line of symmetry.

x = -24/ 2(3)

x = -24/6

x = -4

Therefore, the line of symmetry x = -4.

Thank you.

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