convert centimeter to feet and feet to centimeter. Stepwise show each step

Consider another formula to estimate someone's height based on foot length: foot length (in inches) X 6.54 = height (in inches) Use this formula to calculate your own height: Your height based on this formula: inches. Your actual height = inches. Is this a more accurate mathematical relationship between foot size and height? Explain why or why not.

A rock was dropped from a tall building and took 3 sec to hit the ground . What is the height of the building in the unit meter ? Round to one decimal place

According to the article Alien Antimatter Crashes into Earth 2 : More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an collided with an antineutrino the antimatter answer to the nearly massless neutrino electron, it could produce a cascade of other particles. The "Glashow resonance - phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 %3D times more energy than what's produced in the most powerful colliders on Earth. Let's compare this event to an ordinary baseball with a mass of 146 g. Please use three significant figures in your calculations.

I re-did the calculations for the angles, when i submitted this previously there was an error because angles were over 90 degrees.