book Maths Puzzle Numerical Ability

Please help me with the following problem:
2x^2-2x(3-x+x^2)-5

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HI, I do not know if this statement is true or false(why?)

The row space and the nullspace of an invertible matrix are the same

Ax=b has no solution, then b is not in the col Joe traveled against the wind in a small plane for 3 hr. The return trip with the wind took 2.8 hr. Find the speed of the wind if the speed of the plane in still air is 180mph.