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# Tutor profile: Vanessa R.

Vanessa R.
Recent UCLA graduate with over 2 years of tutoring experience in STEM courses

## Questions

### Subject:Earth Science

TutorMe
Question:

Explain why marine and terrestrial primary production are equal when terrestrial biomass is 2 orders greater in magnitude?

Vanessa R.

Marine turnover rate is very high, meaning organisms have much shorter lifespans than those on land. Faster generation times can therefore allow a higher rate of productivity.

### Subject:Biology

TutorMe
Question:

Why does water become less dense when frozen?

Vanessa R.

Water has a crystalline structure when it becomes ice that requires more space. This structure thus expands when frozen, resulting in ice floating above the water and becoming less dense.

### Subject:Algebra

TutorMe
Question:

If 3^y = 5, then what is the value of 3^2y?

Vanessa R.

25! Instead of figuring out why the first answer is 5, it is important to note what happens when you multiply the exponent, y, by 2. Any answer to the first statement (3^y = 5) will be doubled in the second because we have doubled the exponent (and here, 5^2 = 25).

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