# Posts by Lenna

Total # Posts: 5

**Calculus**

thank you!

*June 18, 2012*

**Calculus**

The position of a particle, s metres from the starting point, after t seconds, is defined by the function s(t) = 2t^3 - 7t^2 + 4 a) determine the velocity of the particle after t seconds b) determine the velocity after 5 seconds

*June 18, 2012*

**Calculus - please check my work**

thank you!

*June 18, 2012*

**math_pre-calc**

Find the equation of a circle that passes through the points (6,3) ans (-4,-3) and whose center lies on the line y=2x-7

*March 11, 2010*

**science**

what is the meaning of the word: deansity. thanh u so_

*February 4, 2009*

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