exam Maths Puzzle Numerical Ability

((3x)^-2)/2x^-1

also

(3x^-2)/2x^-1

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exam Other Question

Decide which is the better buy. Explain - can you please explain to me what exactly the steps are:

a 17 ounce box of cereal for $4,89 or a 21 ounce box for $5.69
Could you help me solve for the ordered pairs?
y=5^(3x+1)
y=25^(-x)