book Maths Puzzle Numerical Ability

How do use a half-angle formula to find the exact value of sin 7pie/8 ?

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book Other Question

How do you change .78 repeating and .66 repeating into a fraction? 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