Verified answer

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A = (2/3)^2 + 2^(-2)

A = 2^2/3^2 + 1/2^2

A = 4/9 + 1/4

A = (4 x 4)/(9 x 4) + (1 x 9)/(4 x 9)

A = 16/36 + 9/36

A = 25/36

B = (-3)^(-3) x 1/2

B = -1/3^3 x 1/2

B = -1/27 x 1/2

B = -1/54

C = -(2/8)^2 + 32^(-1)

C = -2^2/8^2 + 1/32

C = -2^2/(2^3)^2 + 1/32

C = -2^2/(2^(3*2)) + 1/(2^5)

C = -2^(2-6) + 1/2^5

C = -2^(-4) + 1/2^5

C = -1/2^4 + 1/2^5

C = -2/2^5 + 1/2^5

C = -1/2^5

C = -1/32

D = 6^(-2) : (1/3)^(-1)

D = 1/6^2 : 3

D = 1/36 x 1/3

D = 1/(36 x 3)

D = 1/108