The slopes of vertical lines and horizontal lines are negative reciprocals. is it always, sometimes, or never true?

Use the radius you found in part i (r=26.8 cm) with the surface area formula below to find the surface area of the sphere. show your work and round your answer to the nearest tenth. the surface area of a sphere: sa = 4πr^2 self note: 3.8.4

Two lines that do not intersect are skew. always sometimes or never

If 20% of a number is 35, what is 50% of that number?