Which of the following is the equation of a line perpendicular to the line , passing through the point (3,9)?

a. 2x - 3y = 21
b. -2x +3y = 21
c. -2x - 3y = -21
d. 2x +3y = 21

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

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