Arithmetic Means and Series

Insert one arithmetic mean between -8 and 4.

• 14

• -2

• 0

• 6

Insert two arithmetic means between 13 and 37

• 21, 29

• 19, 25

• 20, 26

• 18, 27

Insert 3 arithmetic means between -3, and 37.

• 9, 17, 25

• 11, 21, 31

• 7, 17, 27

• 13, 23, 33

Find the sum of the series  $27+33+39+45+51$  .

• 195

• 198

• 384

• 390

 $\sum_{k=1}^{5\ }5k$  Evaluate the series

• 65

• 70

• 75

• 80

The first and last term of the first 8 terms of an arithmetic series are 3 and 17 respectively. Find the sum of the series.

• 80

• 92

• 101

• 107

The first term of an arithmetic sequence is 9 and the common difference is 2. Find the sum of the first 10 terms.

• 172

• 174

• 178

• 180

 Find the sum of the first 8 terms of the series $0+\left(-4\right)+\left(-8\right)+\left(-12\right)+...$ 

• 102

• 108

• 112

• 204

The first term and last term of an arithmetic sequence are 11 and 21 respectively. If the sum of the series is 96, how many terms are there?

• 5

• 6

• 7

• 8

The sum of an arithmetic series whose first term is 15 and whose common difference is 2 is 95. How many terms are there in the series?

• 5

• 7

• 8

• 9