exam Maths Puzzle Numerical Ability

can you please help me multiply this problem?

4x-40over x^2+10x
times
3xover 10-x

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exam Other Question

which ordered pairs could not be the coordinates of the third vertex?
1. (-4,2)
2. (8,8)
3. (-2,8)
4. (2, 0)
New Problem, Factor:

- t2 + 4 t - 3