book Maths Puzzle Numerical Ability

can someone please the factor the differences of two squares 2 question, thanks
b^2-144
x^-81

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book Other Question

2 1/3{4/3-2/5(3/4+3/7)}

Can anyone help me solve this one.
I am a mom trying to help my child heres what we have.
two plans for a chillie cook off.#1. $7.00 entrance fee 10.cents per cup chili
plan 2.)$5. entrance 25cents per cup. Questi