What is the slope and y-intercept for this graph? (sorry for lots of slope questions I'm still trying to figure it all out :( )

thank you guys

A25-inch wide drum is used in a marching band. what area does the top of the drum cover? round to the nearest hundredth. (use 3.14 for pi.)

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.