exam Maths Puzzle Numerical Ability

3n-2(n-4)-9+n

solve they system using the substitutio method
x+9y=4
-2+7y=-5

identify domain of the function
-x2(squared)+3

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exam Other Question

if y = sqrt x - 1 fill in the following table for x = 0,1,2,3,4 Round to the nearest 3 decimal places where necessary. This is what I came up with but I feel like it's not right. P I need help on Exponential Growth. I know it increase the quanity over time but Can you give me an example of a function that grows? Can you show me the graph also?