exam Maths Puzzle Numerical Ability

evaluate 7 - 2(15-2 to the 3rd power) 3 to the 2nd power - 5 (3) This is the best way I can type it.

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exam Other Question

Solve each of the following systems by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.
x+5y=10
-2x-10y=-20
(x^2-2x-15)(x-4)=0 solve by finding roots