book Maths Puzzle Numerical Ability

What is -1/8 X 2 X 4/-7? I cannot find anything that will help me with this type of problem.

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book Other Question

Hi I have not a clue how to do any of the proportions and I have a test this coming week! We have all of this proportions and tax-n-tip things and I feel as if I am the only one in simplify.
square root of 32a with an exponent of 3, b with exponent of 2 and c with no exponent.
please help me to solve this problem.