exam Maths Puzzle Numerical Ability

the total area of six faces of a cube is 240 cm^2 how long to the nearest 10th is one egde

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exam Other Question

Solve the system by addition or substitution.
-15x + 3y = 9
y = 3 + 5x

Please help me with this problem step by step if at all possible then maybe I can actually catch on, on how to do these problems. THANK YOU!! Solve the system by addition. -3x - 4y = -2
x + 3y = -6