book Maths Puzzle Numerical Ability

I'm just starting Pre-Algebra and I need to write equations for word problems and show the variable and show work anc can get help anywhere.

#1 word problem:

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book Other Question

Find the inverse of the following matrix.

A = [2 4]
[1 -3] Write the equation for the axis of symmetry of the graph of the equation y=5+16x-2x^2 (Hint: Rewrite the equation so that it fits the standard form of a quadratic function.)