Arithmetic Sequences and Series

From an arithmetic series it is known that U3 = 13 and U7 = 29. The total of twenty-five terms The first in the series is...

• 3250

• 1325

• 1225

Of an arithmetic sequence, the third term is 36, the sum of the fifth and seventh terms is 144. The sum of the first ten terms of the series is….

• 660

• 640

• 630

The fourth and seventh terms of an arithmetic sequence are consecutive are 17 and 29. The 25th term of the sequence is ....

• 81

• 90

• 101

In a performance hall, chairs are arranged with the front row consisting of 12 chairs, the second row contains 14 seats, the third row contains 16 seats, and so on. The number of seats on the 20th row is....

• 50

• 70

• 55

From an arithmetic sequence it is known that the 5th term is 22 and term

The 12th term is 57. The 15th term of this sequence is...

• 62

• 68

• 72

The second term of the arithmetic sequence is 5 and the fifth term is 14.

The 20th term of the arithmetic sequence is...

• 62

• 63

• 59

The formula for the nth term of the sequence 5, –2, –9, –16, … is…

• 12-7n

• 5-7n

• -2-7n