exam Maths Puzzle Numerical Ability

Factor completely. If it is prime, say so.

x^2+40x+400

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exam Other Question

Solve by elimination:

2x+3y=21
5x-2y=-14 Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have?

Thanks for any help you can provide for me.