What is the 1st step to simplify this problem 3^-1 + 9^-1

Acircle has a circumference of 7.850 units. what is its radius?

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?

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?