exam Maths Puzzle Numerical Ability

Can someone help me with this expression?

2/5w+10-3/2w-4

These are really confusing me! Thank you!

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exam Other Question

please help me with this question :)

-10+4(3p+10)=18 The surface area of a cube is the sum of the areas of the faces. Use exopents to write an expression for the surface area of the cube. (3sides-3cm)