exam Maths Puzzle Numerical Ability

if a line is horizontal,its slope is 1,0,underfined,negative

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exam Other Question

Write ((81^x+1)(1/9^4-x)) / 27(243)(^x-2) as a single power. A man buys a lamp and a table for 390 $. The table cost 80 $ more than the lamp. Find the cost of each aricle.