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8 questions · timed · auto-graded

Question 21 Mark
Evaluate:$\left[\left(10^3\right)^0\right]^5$
Answer
$\left[\left(10^3\right)^0\right]^5=10^{3 \times 0 \times 5}=10^0=1$
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Question 61 Mark
Evaluate:$8^0+4^0+2^0$
Answer
$\begin{aligned} & 8^0+4^0+2^0 \\ & =1+1+1=3\left(\because a^0=1\right)\end{aligned}$
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Question 81 Mark
Evaluate:$\left\{\left(\frac{3}{5}\right)^{-2}\right\}^{-2}$
Answer
$ \left\{\left(\frac{3}{5}\right)^{-2}\right\}^{-2}$
$=\left(\frac{3}{5}\right)^{-2 \times(-2)}$
$=\left(\frac{3}{5}\right)^4$
$ =\frac{3 \times 3 \times 3 \times 3}{5 \times 5 \times 5 \times 5}$
$=\frac{81}{625}$
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[1 Mark Question Answer] - MATHS STD 8 Questions - Vidyadip