A building has 10 doors. 5 of them are two way, 3 are entrance only, 2 are exit only. How many ways can a person enter and exit building

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step-by-step explanation:

5/12, or 5: 12

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step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function

where is the graph, sweetheart?

step-by-step explanation: