book Maths Puzzle Numerical Ability

Write 0.8(with a line over the 8) as a fraction in lowest terms. How do I do this? Thank you.

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book Other Question

Please, I need help with these problems. I confused on how to get started on it,
a)3y^2-4y-4

b)2x^2+12x-7=-2

c)[(x/3+4)]^2=27
marie
hi kim when you see an algrebric expression how do uyou know what number to add or subtract to both sides.