exam Maths Puzzle Numerical Ability

Determine whether the graph of each parabola opens upward or downward.

y=-1/2x2+3

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exam Other Question

A cargo plane flew to the maintenance facility and back. It took one hour less time to get there than it did to get back. The average speed on the trip there was 220 mph. The average speed on the way back was 200 mph. How many hours did the trip take? Solve -33=-4y

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