exam Maths Puzzle Numerical Ability

"What is the height of a building with 6 floors given by the formula h= 20.6 + 3.5n"
Thank you.

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exam Other Question

multiply using the foil method
(2x - 3)(x^2 + 5x - 3)
Solve the following matrix

[1 1 700]
[20 25 15]
[ 1 0 5]
I am dumbfounded on how to solve this.