1.

The value of (2/5)-2 is:(a) 4/5 (b) 4/25 (c) 25/4 (d) 5/2

Answer»

(c) 25/4

Explanation: By the law of exponent we know: a-n = 1/an.

Hence, (2/5)-2 

= 1/(2/5)2 

= 1/(4/25) 

= 25/4



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