The power of 9 to the 2nd power is equivalent to 81 what is the value of 9 to the negative 2

1/81

Step-by-step explanation:

9 to the power of -2 = 1^2/9^2

1/81

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1/81

Step-by-step explanation:

Let L denotes the length in meter of the given iron rod that costs Rs 60. So the cost per meter of this iron rod = 60/L.

It is given that If the rod was 2 meters shorter and each meter costs Rs. 1.00 more, the cost would remain unchanged. So we get the following equation,

(L - 2)*(60/L + 1) = 60 or L*(60/L) + L - 2*(60/L) - 2 = 60 or L - 120/L - 2 = 0

or L^2 - 2L - 120 = 0 or (L - 12)(L + 10) = 0

Hence, as because L>0 therefore we have L = 12 (meters)

Step-by-step explanation:

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