exam Maths Puzzle Numerical Ability

While on vacation,Allison noted that a $5.50 breakfast actually cost her $5.83 because of sales tax. what is the sales tax?

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3. For the function f(x)= -3(x-4) ² + c, as c decreases, how does the graph of
f(x) change?
Not in book, worksheet. Need help please, not sure what the test point is.

If a test point results in a true statment, what do yo know about the graph and hen can the origin not