13. Adam claims that any two congruent triangles must have the same perimeter. Do you agree? Explain your reasoning.

5. The volume of a cone is given by \( V=\frac{1}{3} \pi r^{2} / \% \). Determine the volume of the cone in simplificd form if the radius is increased by \( x \) and the height is increased by \( 2 x \).

What is the slope of the line that passes through the points \( (6,-8) \) and \( (6,-3) \) ? Write your answer in simplest form.

What is the slope of the line that passes through the points \( (6,-5) \) and \( (-6,-5) \) ? Write your answer in simplest form.

Complete: \( 18 \mathrm{~m}^{2}=\quad \mathrm{cm}^{2} \). A. \( 180 \mathrm{~cm}^{2} \) B. \( 1800 \mathrm{~cm}^{2} \) C. \( 18000 \mathrm{~cm}^{2} \) D \( 180000 \mathrm{~cm}^{2} \)

What is the slope of the line that passes through the points \( (-10,9) \) and \( (-10,18) \) ? Write your answer in simplest form.