exam Maths Puzzle Numerical Ability

Use the mapping rule method to sketch the graph of the following function:
y=2(3)^(-x+1)+4
What is the Transformational Form:
Write the mapping rule:
Show the table of values:

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exam Other Question
if the area if a triangular sail is 10 square feet and the base is 4 feet long, find the sail height If f (x) = 5x – 1, find the following:

9. f (a -2)