exam Maths Puzzle Numerical Ability

Factor the following expression:

a^2(b - c) - 16b^2(b - c)

I need help yet again, please!!

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exam Other Question

On a 130 mile trip, a car traveled at an average speed of 55 mph and then reduced its speed to 40 mph for the remainder of the trip. The trip took a total of 2.5 hours. For how long did the car travel at 40 mph? get the algebric expessionin the following casesusing variables,