book Maths Puzzle Numerical Ability

we are stuck trying to solve this type of problem:

4a to the third power over 20a to the sixth power
we need help dividing exponents

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book Other Question

Find the point of the intersection of the following system of equations algebraically

x^2-Y=5
and 2X+y=3
Identify the shape of the graph, transform it into standard form, and sketch the graph.
x^2 - 4y^2 + 4x -24y - 36 = 0