Question

Give me the answer of these questions out of which only one is correct.

Answer 1

Answer:

Step-by-step explanation:

19. A = 54 , d = 51-54 = -3

A*10 = a+(n-1)d

= 54+(10-1)(-3)

=54+(9)(-3)

=54-27 = 27

21. Pie r² = 38.5

22×r²/7 = 38.5

R² = 38.5×7÷22

R² = 12.25

R=/12.25 = 3.5cm