exam Maths Puzzle Numerical Ability

Hi, my son is having problems with his pre algebra homework. His teacher has not issued a math book to assist. his two equations are
8(2x-3)-6x, if x=3
9-2(4x+5) if x = -4
will you be able to assist thank you

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exam Other Question

1) What can you tell about the graph of a polynomial function by examining the leading coefficient? (Assume the polynomial is arranged in descending order.)

2) What can you t This question involves the doubling time formula. Use the approximate doubling time formula in the following exercise. Be sure to discuss whether the formula is valid for the case