exam Maths Puzzle Numerical Ability

How do you solve the equation {{{m+2w=-5}}} if the domain is {-3, 0, 4}?

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exam Other Question

Simplify

2x - 10/x2nd power - 25 divided by x2nd power - 2x -15/x2nd power - 4x -5 Arrange in order from smallest to largest.
2.05, 25/10, 2.0513, 2.059, 251/100, 2.0515, 2.052, 2.051

Can someone please help me. Once again I do not even no where to start. (the 25/20 and 251/100 are fractions.)