exam Maths Puzzle Numerical Ability

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?

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exam Other Question

find the length of the segment with the given endpoint and midpoint M.
W(5,3) and M(-10,-5) 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