exam Maths Puzzle Numerical Ability

Graph the inequality 3x-4y is less than 12

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exam Other Question

The edges of three cubes are consecutive odd integers. If the cubes are stacked as shown the total exposed surface area is 381 cm2. Find the lengths of the sides of the cubes.

i need an equation for this pls.. Can someone show me how to write the mapping rule that shows the transformation of y=2^x for the equation 1/4(y-5)=2^(x-3)?