Answer:

1. An=a1+(n-1)d

An=15+(7-1)4

7th term = 39

2.An=a1+(n-1)d

An=13+(7-1)10

7th term=73

3.An=a1+(n-1)d

An=29+(7-1)-2

7th term=17

4.An=a1+(n-1)d

An=0+(7-1)5

7th term=30

5.An=a1+(n-1)d

An=9+(7-1)12

7th term=81

Step-by-step explanation:

SINOLVE

Step-by-step explanation:

an = a1 + (n - 1) d

1. 15, 19, 23

a1 = 15

n = 7

d = 4

a7 = 15 + (7 - 1) 4

a7 = 15 + (6) 4

a7 = 15 + 24

a7 = 39

2. 13, 23, 33

a7 = 13 + (7 - 1) 10

a7 = 13 + (6) 10

a7 = 13 + 60

a7 = 73

3. 29, 27, 25

a7 = 29 + (7 - 1) -2

a7 = 29 + (6) -2

a7 = 29 - 12

a7 = 17

4. 0, 5, 10

a7 = 0 + (7 - 1) 5

a7 = 0 + (6) 5

a7 = 0 + 30

a7 = 30

5. 9, 21, 33

a7 = 9 + (7 - 1) 12

a7 = 9 + (6) 12

a7 = 9 + 72

a7 = 81