book Maths Puzzle Numerical Ability

Find the inverse of the following matrix.

A = [2 4]
[1 -3]

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book Other Question

Divide and simplify

3x^2 +13x + 4 / 3x^2-5x-12
____________ ________________
16-x^2 3x-12 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: