exam Maths Puzzle Numerical Ability

can you help me understand how to find the vertex, the line of symmetry, and range with this problem

for the graph of the function f(x)=-x^2+6x-8

a. find the vertex

b. the

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exam Other Question

Use either the fundamental counting principle or the permutation formulas (or both) to answer the following:

In how many different ways can 6 classes be scheduled during a 6-period day?
Could you please help me with this problem?

Express in terms of i

^-100 =
The radical is -100

Thank-you