# Tutor profile: Sierra M.

## Questions

### Subject: French

Conjugate the verb être in the present tense.

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

### Subject: Psychology

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?

The SCN (suprachiasmatic nucleus)

### Subject: Algebra

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

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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