Question

27) Find the following sums.

a) 1+2+3+........+20

b) 5+10+15+.....+100

c) 7+12+17+......+102

28) Find the following sums.

a) 1+2+3+4+........+10

b) 6+12+18+........+60

c) 5+11+17+.........+59

29) What is the difference between the sum of the first 25 terms and the next 25 terms of

the arithmetic sequence 4, 9, 14, 19, .......

30) Calculate the difference between the sums of the first 20 terms of the arithmetic

sequences 4, 7, 10, ..... and 9, 12, 15, .........

31) Look at the pattern given

4

7 10

13 16 19

........................

a) Write the first and the last numbers of the 10th line​

Answer 1

Answer:

$5.y \sqrt[57$

Answer 2

Answer:

27.

a) 210

b) 1,050

c) 1,090

28.

a) 55

b) 330

c) 320

29. 4,725

30. 125

31.

a) 138 (first) and 165 (last)

hope it helpss :))