exam Maths Puzzle Numerical Ability

Factor the expression.

a squared(b-c)-16b squared(b-c)

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exam Other Question

Write the equation of the line that passes through point (-2,3) with a slope of -4

Please help
the following is an equation describing growth of bacteria. A=Asubo 2^t/d
which term gives the number you start with?
which term is doubling time?
If you start with 100 bacteria