book Maths Puzzle Numerical Ability

Can someone help me with this?

Choose the most reasonable measure.

The height of a bookshelf

(A) 12 cm
(B) 12 m
(C) 1.2 m

Thanks,
Lyn

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book Other Question
How do use a half-angle formula to find the exact value of sin 7pie/8 ? Graph each function. State the y-intercept. Then use the graph to determine the approximate value of the given expression. y=10^x; 10^0.3