Question

please answer all 8 questions please ​

Answer 1

Step-by-step explanation:

a8 = 17

a19 = 30

a + 7d = 17 eq1

a + 18d = 39 eq2

subtract eq 1 and 2

we get,

11d = 22

d = 2

common difference = 2

Answer 2

Answer:

1. t8 = a+7d

17=a+7d. .......1

t19 = a+18d.

39=a+18d. ....2

subtracting equation 1 from 2

39=a+18d

17=a+7d

---------------

22=11d

d=2

15.

area of sector= thita × pie × r^2

360

=60 ×3.14× 6×6

360

=1 ×3.14 ×6×6

6

= 3.14×6

= 18.84 sq cm.

16...

x + 2y =4. ...1

4x-2y=6 ...2

adding eqn 1 and 2

5x=10

x = 2