book Maths Puzzle Numerical Ability

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

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HOW WOULD YOU SIMPLIFY THIS EXPRESSION AND WHAT IS THE THINKING IN DOING SO ?


8A + B - 2A - 4B
two parallel chords, 16 cm and 30 cm are 23 cm apart. find the radius of the circle that contains them.