Which statement is true?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Acircle has a circumference of 28.36 units what is the diameter of the circle

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? )