Question

help me in these three ques​

Answer 1

8. c.180

9. c.28

10. c.a-b

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Answer 2

Answer:

C.

C.

C.

Step-by-step explanation:

x = 4, y = x + 9

On substituting, we get,

3{2 × 4 + 4(4 + 9)}

= 3{8 + 4 × 13} = 3{8 + 52} = 3 × 60 = 180

a+b = 13, b+c = 24, c+a = 19.

∴ a+b+b+c+c+a

= a + a + b + b + c + c

= 2a + 2b + 2c

= 2(a + b + c)

= 13 + 24 + 19        (clear?)

= 56

∴ a + b + c = 56/2 = 28

a - (a - b) - b - (b - a)

= a - a + b - b - b + a

= 0 - b + a

= a - b