Help Pls. I don’t know this answer

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )