book Maths Puzzle Numerical Ability

What is the answer to -1=4 + n

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book Other Question

$600 is borrowed at an interest rate of 1.4% per month. Find the interest for a 30 month period.
$_____
---is it $18000???
thank u very much PLEASE HELP ME FACTOR AND SOLVE THIS:
8d^3 + 4d^2 + 12d