exam Maths Puzzle Numerical Ability

Multiply.

7w(2w-3)(2w+3)

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exam Other Question

A plum and a pineapple cost the same as three peaches. Two plums cost the same as a peach. How many plums cost the same as a pineapple? Help with this matrix would be much appreciated!

find and write the linear system corresponding to matrix and solve it

[1 0 0 | 7 ]
[0 1 0 | -3 ]
[0 0 2 | 6 ]