exam Maths Puzzle Numerical Ability

Find

8b(1.7f)

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exam Other Question

AHHH! I need help with this one. I am so confused when it comes to matrices and now adding letters too???

Encoding matrix A = [3 5 (top)
1 2 (bottom)]
C explain why the graph of the reflection of the function y=2[x] in the line y=x is not the graph of a function