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SSAT Upper Level Math : Other Arithmetic Sequences

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Example Questions

Example Question #11 : Arithmetic Sequences

Leon makes $\$2.00$ for the first hour of work, $\$6.00$ for his second hour of work, $\$10.00$ for his third hour of work, and so on. How much will he make for his $12^{th}$ hour of work?

Possible Answers:

$\$46$

$\$50$

$\$54$

$\$42$

Correct answer:

$\$46$

Explanation:

You should recognize this as an arithmetic sequence:

2, 6, 10...

The question is asking you to find the 12th term in this particular sequence.

To find any term in an arithmetic sequence, use the following formula:

y_n=a_1+(n-1)d

is the term we want to find
is the first term of the sequence
is the number of the term we want to find
is the common difference

Using the information given from the question,

a_1=2

n=12

d=4

Now, plug in the information to find the value of the 12th term.

$y_{12}=2+(12-1)(4)=2+(11)(4)=2+44=46$

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Example Question #12 : Other Arithmetic Sequences

Find the sum of the first terms of the following arithmetic sequence:

-10, -4, 2, 8...

Possible Answers:

Correct answer:

Explanation:

To find the sum of a certain number of terms in an arithmetic sequence, use the following formula:

$\text{Sum}=\frac{n(y_1+y_n)}{2}$

the number of the terms you have
the first term of the sequence
$y_n=n^{th}$ term of the sequence

To find the sum, we need to first find the 8th term of the sequence.

To find any term in an arithmetic sequence, use the following formula:

y_n=a_1+(n-1)d

is the term we want to find
is the first term of the sequence
is the number of the term we want to find
is the common difference

Using the information given from the question,

a_1=-10

n=8

d=-4-(-10)=6

Now, plug in the information to find the value of the 8th term.

y_8=-10+(8-1)(6)=-10+(7)(6)=-10+42=32

Now that we know the 8th term of the sequence, we can plug in that value into the equation for the sum to find what these first 8 terms add up to.

$\text{Sum}=\frac{8(-10+32)}{2}=\frac{(8)(22)}{2}=88$

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Example Question #13 : Other Arithmetic Sequences

Find the sum of the first terms of the following arithmetic sequence:

15, 11, 7, 3...

Possible Answers:

Correct answer:

Explanation:

To find the sum of a certain number of terms in an arithmetic sequence, use the following formula:

$\text{Sum}=\frac{n(y_1+y_n)}{2}$

the number of the terms you have
the first term of the sequence
$y_n=n^{th}$ term of the sequence

To find the sum, we need to first find the 9th term of the sequence.

To find any term in an arithmetic sequence, use the following formula:

y_n=a_1+(n-1)d

is the term we want to find
is the first term of the sequence
is the number of the term we want to find
is the common difference

Using the information given from the question,

a_1=15

n=9

d=11-15=-4

Now, plug in the information to find the value of the 9th term.

y_9=15+(9-1)(-4)=15+(8)(-4)=15+(-32)=17

Now that we know the 9th term of the sequence, we can plug in that value into the equation for the sum to find what these first 9 terms add up to.

$\text{Sum}=\frac{9(15+(-17))}{2}=\frac{(9)(-2)}{2}=-9$

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All SSAT Upper Level Math Resources

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SSAT Upper Level Math : Other Arithmetic Sequences

Study concepts, example questions & explanations for SSAT Upper Level Math

All SSAT Upper Level Math Resources

Example Questions

Example Question #11 : Arithmetic Sequences

Example Question #12 : Other Arithmetic Sequences

Example Question #13 : Other Arithmetic Sequences

All SSAT Upper Level Math Resources

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