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Activities Activity 1. Find me Find the next three terms in each sequence. Then write the rule for finding the nth term. 1. 10, 15, 20, 25, 2. 20, 16, 12, 8, Rule: Rule: 3. 3, 5, 7, 9, 4.2, 5, 8, 11, Rule: Rule: 5. 1 1 1 1 2' 3' 4' 5" 6.-2,-4, -6, - Rule: Rule:​

Activities Activity 1 Find Me Find The Next Three Terms In Each Sequence Then Write The Rule For Finding The Nth Term 1 10 15 20 25 2 20 16 12 8 Rule Rule 3 3 5 class=

Sagot :

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Answer:

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Answer:

Finding the nth Term of a Sequence

In finding the nth term of any sequence, we need to know the common difference or ratio. To know the common difference or ratio, subtract or divide any two consecutive terms of the sequence. The common difference or ratio is used to find the next terms of the sequence. Be careful in addition especially if the common difference or ratio is a negative number.

Answers:

A. 30, 35, 40 Rule: add 5

B. 4, 0, -4 Rule:  subtract 4

C. 11, 13, 15 Rule: add 2

D. -8, -10, -12 Rule: subtract 2

E. ,  ,   Rule: square the numerator, copy the denominator

F. 4, 0 , -4 Rule: subtract 4

G. 14, 17, 20 Rule: add 3

H. , ,  Rule: add

I. 81, 243, 729 Rule: raise 3 to the nth power.

J. 30, 36, 42 Rule: add 6

Solutions:

A. 10, 15, 20, 25, ___, ___, ____

Given:

a₁ = 10

a₂ = 15

Find d.

d = a₂ - a₁

d = 15 - 10

d = 5

Find a₅.

a₅ = a₄ + d

a₅ = 25 + 5

a₅ = 30

Find a₆.

a₆ = a₅ + d

a₆ = 30 + 5

a₆ = 35

Find a₇.

a₇ = a₆ + d

a₇ = 35 + 5

a₇ = 40

Therefore, the next three terms are 30, 35, 40.

Rule: add 5

B. 20, 16, 12, 8, ___, ___, ___

Given:

a₁ = 20

a₂ = 16

Find d.

d = a₂ - a₁

d = 16 - 20

d = -4

Find a₅.

a₅ = a₄ + d

a₅ = 8 - 4

a₅ = 4

Find a₆.

a₆ = a₅ + d

a₆ = 4 - 4

a₆ = 0

Find a₇.

a₇ = a₆ + d

a₇ = 0 - 4

a₇ = -4

Therefore, the next three terms are 4, 0, - 4.

Rule: subtract 4

C. 5, 7, 9, ___, ___, ___

Given:

a₁ = 5

a₂ = 7

Find d.

d = a₂ - a₁

d = 7 - 5

d = 2

Find a₄.

a₄ = a₃ + d

a₄ = 9 + 2

a₄ = 11

Find a₅.

a₅ = a₄ + 2

a₅ = 11 + 2

a₅ = 13

Find a₆.

a₆ = a₅ + 2

a₆ = 13 + 2

a₆ = 15

Therefore, the next three terms are 11, 13, 15.

Rule: add 2

D. -2, -4, -6, ___, ___, ___

Given:

a₁ = -2

a₂ = -4

Find d.

d = a₂ - a₁

d = -4 - (-2)

d = -4 + 2

d = -2

Find a₄.

a₄ = a₃ - 2

a₄ = -6 - 2

a₄ = -8

Find a₅.

a₅ = a₄ - 2

a₅ = -8 - 2

a₅ = -10

Find a₆.

a₆ = a₅ - 2

a₆ = -10 - 2

a₆ = -12

Therefore, the next three terms of the sequence are -8, -10, -12.

Rule: subtract 2

E. , , , ___, ___, ___

Given:

a₁ = , n = 1

a₂ = , n = 2

Find r.

r =

Find a₄.

a₄ =

a₄ =

Find a₅.

a₅ =

a₅ =

Find a₆.

a₆ =

a₆ =

Therefore, the next three terms of the sequence are ,  ,  .

Rule: square the numerator and copy the denominator

F. 20, 16, 12, 8, ___, ___, ___

Given:

a₁ = 20

a₂ = 16

Find d.

d = a₂ - a₁

d = 16 - 20

d = -4

Find a₅.

a₅ = a₄ - 4

a₅ = 8 - 4

a₅ = 4

Find a₆.

a₆ = a₅ - 4

a₆ = 4 - 4

a₆ = 0

Find a₇.

a₇ = a₆ - 4

a₇ = 0 - 4

a₇ = -4

Therefore, the next three terms of the sequence are 4, 0 , -4.

Rule: subtract 4

G. 2, 5, 8, 11, ___, ___, ___

Given:

a₁ = 5

a₂ = 2

Find d.

d = a₂ - a₁

d = 5 - 2

d = 3

Find a₅.

a₅ = a₄ + d

a₅ = a₄ + 3

a₅ = 11 + 3

a₅ = 14

Find a₆.

a₆ = a₅ + d

a₆ = 14 + 3

a₆ = 17

Find a₇.

a₇ = a₆ + d

a₇ = 17 + 3

a₇ = 20

Therefore, the next three terms of the sequence are, 14, 17, 20.

Rule: add 3

H. , , , ___, ___, ___

Given:

a₁ =

a₂ =

Find d.

d = a₂ - a₁

d =  -

d =

Find a₄.

a₄ = a₃ + d

a₄ =  +

a₄ =

Find a₅.

a₅ = a₄ + d

a₅ =  +

a₅ =

Find a₆.

a₆ = a₅ + d

a₆ =  +

a₆ =

Therefore, the next three terms of the sequence are , , .

Rule: add

I. 3, 9, 27, ___, ___, ___

Given:

a₁ = 3 = 3¹

a₂ = 9 = 3²

Find a₄.

a₄ = 3⁴

a₄ = 81

Find a₅.

a₅ = 3⁵

a₅ = 243

Find a₆.

a₆ = 3⁶

a₆ = 729

Therefore, the next three terms of the sequence are 81, 243, 729.

Rule: raise 3 to the nth power.

J. 6, 12, 18, 24, ___, ___, ___

Given:

a₁ = 6

a₂ = 12

Find d.

d = a₂ - a₁

d = 12 - 6

d = 6

Find a₅.

a₅ = a₄ + d

a₅ = 24 + 6

a₅ = 30

Find a₆.

a₆ = a₅ + d

a₆ = 30 + 6

a₆ = 36

Find a₇.

a₇ = a₆ + d

a₇ + 36 + 6

a₇ = 42

Therefore, the next three terms of the sequence are 30, 36, 42.

Rule: add 6

Step-by-step explanation:

hope it helps!

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