# Tutor profile: Alexis S.

## Questions

### Subject: Biology

What are two apomorphies characteristic of the Chondrichthyes? What two taxons fall under Chondrichthyes?

Two apomorphies: 1) Pelvic claspers on male 2) Placoid scales Two taxons within Chondrichthyes: 1) Holocephali 2) Elasmobranchii

### Subject: Algebra

Simplify the equation below: 12x -36i > 3 (4x - 36u)

12x -36i > 3 (4x - 36u) 12x -36i > 12x -108u -12x -12x ------------------------------ -36i > -108u ------ ----- -36 -36 i < 3u

### Subject: Physics

If an object's mass stayed constant, and the acceleration decreased by a factor of 2, what force would be necessary to make this situation true?

Due to Newton's second law, force is equal to mass times acceleration (F=ma); so if mass stays constant, and acceleration decreases by a factor of 2, then the force must increase by a factor of 2 to keep everything equal.

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