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Mary B.
Math tutor for 2 years
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Spanish
TutorMe
Question:

What is the correct way of saying the following? Mi hermana (hayan/hubiera) salido con ellos. Yo (hice/hicimos) lo que pude.

Mary B.
Answer:

Mi hermana hubiera** salido con ellos. Yo hice** lo que pude.

Biology
TutorMe
Question:

If the solute concentration of blood is 0.9%, what would your red blood cells look like if they where placed in 5% NaCl? Why?

Mary B.
Answer:

The red blood cells would shrivel because osmosis causes the more concentrated water that is inside the cell to move towards the less concentrated water that is outside the cell. The water leaving the cell would cause the cell to dehydrate and shrivel.

Statistics
TutorMe
Question:

In a class of 20 students, 13 of the students chew gum while taking a test, and the rest of the students do not. If three students from the class are randomly selected (without replacement), what is the probability all three chew gum while taking a test?

Mary B.
Answer:

13/20 * 12/19 * 11/18 = 1716/6840 = .251

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