What is the equation of the normal to the curve x^2 + y^2 = 25 at (4, 3)?
Problem
What is the equation of the normal to the curve $x^2 + y^2 = 25$ at (4, 3)?
| A. $4x + 3y = 0$ | C. $3x + 4y = 0$ |
| B. $3x - 4y = 0$ | D. $4x - 3y = 0$ |
May 1995
What is the radius of the circle x^2 + y^2 - 6x = 0?
Problem
What is the radius of the circle $x^2 + y^2 - 6x = 0$?
| A. 6 | C. 4 |
| B. 9 | D. 3 |
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