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# Tutor profile: Chelsea D.

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Chelsea D.
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## Questions

### Subject:Chemistry

TutorMe
Question:

Which popular substance can simultaneously exist as solid, liquid and gas.

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Chelsea D.

Water

### Subject:Biology

TutorMe
Question:

How does the phospholipid bilayer help cells to keep their contents whilst guarding against unwanted substances?

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Chelsea D.

The phospholipid bilayer is both hydrophobic and hydrophilic which helps it to only interact with water and gas molecules; and guard against large and fatty molecules that the cell doesn't need.

### Subject:Algebra

TutorMe
Question:

If there are 50 sheep per shepherd and there are eight shepherds, how many sheep are there in total?

Inactive
Chelsea D.

To answer this question, we need to obtain a ratio: 50 sheep : 1 shepherd The number of sheep per 8 shepherds, we will call x Therefore; 50:1 Then we will cross multiply- 1x=400 x=400 There are 400 sheep in total x :8

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