exam Maths Puzzle Numerical Ability

Please help me "evaluate the expression" for a= -2, b= 4, c=3

2b^ - 4ac + bc

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exam Other Question

Solve the equation

48. On a train, it took 3/4 hour to travel a distance of 52 1/2 miles. What was the average speed of the train?

Any help with this equation would be Greatly</b> appreciated. What function represents the geometric sequence ( 3,15,75,375,...)?