exam Maths Puzzle Numerical Ability

find two arithmetic means between 5 and -4.
thanks i hope you can help!

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exam Other Question

Solve the following system of linear inequalities by graphing.

x+2y<3 or equal
2x-3y<6 or equal
I don't know how to under the < but they both are underlined in the problem. Th 4u^2+8u+15=0 solve by completing the square.