book Maths Puzzle Numerical Ability

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A pair of jeans sells for $36 after a 25% discount. What is the original price of the jeans?

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book Other Question
What is the slope of the line: x/3 - (- y/5) = 1
What is the domain for g(x) = (6 + x)(4 + x)
What is the domain for f(x) = 2(x - 5)^2 - 8
What is the range for f(x) = 9 - 8x - x^2
 how do I solve, everything in the parenthesis is raised to the -4th power

(-7a^2b^3c^0)^-4
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( 3a^3b^4c^3)