exam Maths Puzzle Numerical Ability

What is the slope of 6X-(-3)

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My teacher came up with this problem.
You must multiply the matrices.

[ 2 0 1] x [-2 3]

[-3 4 0] x [4 -1]

x [
the polynomial 0.041h-0.018a-2.69 can be used to estimate the lung capacity in liters of a female with h in cm and age (a) in years ,find the lung capacity of a 40 yr old woman who