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# Tutor profile: Sierra M.

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Sierra M.
Senior at University of Michigan
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## Questions

### Subject:French

TutorMe
Question:

Conjugate the verb être in the present tense.

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Sierra M.

je sais tu es il/elle est nous sommes vous êtes ils/elles sont

### Subject:Psychology

TutorMe
Question:

Which part of the brain is often referred to as the 'biological clock' because of its role in maintaining rhythms such as circadian rhythms that regulate our sleep?

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Sierra M.

The SCN (suprachiasmatic nucleus)

### Subject:Algebra

TutorMe
Question:

Solve for the values of x in the equation: x^2 - 6x + 9 = 0

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Sierra M.

To solve for x in this equation you must factor it. In this case we can see that the middle number is preceded by a minus sign, this means that in our two factors one will contain a plus and one will contain a minus. Next we should determine how the number 9 can be created from its factors: 3x3 or 1x9. There is only one case in which the numbers multiplied together get 9 and when added get 6 that is 3 and 3. Now we can write out the factors: (x-3)(x+3) = 0, now we can solve for the values of x by placing each factor each equal to 0: x-3 = 0 and x+3 = 0. Adding and subtracting 3 from each side of each equation respectively will give us our values for x: x = 3 and -3

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