exam Maths Puzzle Numerical Ability

Please help.
Factor the trinomial.
16x^2 + 40xy + 25y^2

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exam Other Question

Solve by using substitution or elimination:
x=3y+11
2x+5y=0 Can anyone help me with the following problem?

The LORAN system (LOng RAnge Navigation) uses two radio transmitters 26 miles apart to send simultaneous signals. The navigator on