book Maths Puzzle Numerical Ability

if the triangle area is 54 and the base is 12 then what is the height?

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book Other Question

Identify the shape of the graph, transform it into standard form, and sketch the graph.
x = -2y^2 + 12y - 15 The first side of a triangle is 3 cm longer than the second side. The third side is 4 cm shorter than twice the second side. The perimeter is 31 cm. How long is each side?