I don't get this science

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

If a balloon is taken outside on a very cold day, what will occur?

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?