exam Maths Puzzle Numerical Ability

2x to the second power- 28

a squared+25-10a

2x squared-11x+12

x cubed+24x squared+144x

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exam Other Question

Trains at each end of the 50.0 km long Eurotunnel under the English Channel start at the same time into the tunnel. Find their speeds if the train from france travels 8.0km/h faster than the train from England and they pass in 17.0 min. Solve the following linear programming model graphically and explain the solution result:

MAX: Z=110x1 + 75x2
subject to
2x1 + x2> or =40
-6x1 + 8x2< or =120
70x1