What is the equation of the tangent line to the curve y= 6x - x2 - 5 at the point (4.3 ) ?

a. x-y= 1
b. x + y = 7
c. 2x- y = 5
d. 2× + y = 11

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

∆red ≅ ∆ by rule will give brainiest if possible

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.