Find the area of the figure plz i don't understand

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The volume, v, of a rectangular prism is determined using the formula, where / is the length, w is the width, and his theheight of the prism. carltren solves for w and writes the equivalent equation w=using this formula, what is the width of a rectangular prism that has a volume of 138.24 cubic inches, a height of 9.6 inches,and a length of 3.2 inches?