Value of 81 to the power of - 1/2​

1/9

9

Step-by-step explanation:

81 to the power of 1/2 is the same as the square root of 81, which gives 9. It's because the square root has an invisible 2 which most of you can't see with your mathematical eye and 81 is raised to the power of 1 inside the square root.

(d)

step-by-step explanation:

given: the line in the graph passes through points (5,30) and (6,26).

then, the equation of line is:

now, put y=a(n) and x=n,

hence, option d is correct.