book Maths Puzzle Numerical Ability

I don't understand how to do some of these problems. If you can help me, how do you solve Matrix products and how do you simplify expressions?

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book Other Question

Solve the equation

100e^-0.6=20
For the function, y=1/(x-2)

a) Give the y values for x = -2, -1, 0, 1, 2, 3.
Answer:

Show work in this space.



b) Using these points, draw a curve.
Show graph here.