3 because of the thing it’s trying to say
The ostrich runs 21 N then goes back by 25 S
The displacement is -4 S
21 - 25 = -4
Answer is: <span>it comes at the right time.
Some of the chemistry discoveries that come in right time (with enough informations, knowledge and right technology to use that discovery) are: </span>Periodic Table of the Elements, discovery of electron, proton, neutron, radioactivity, pasteurization, t<span>he Haber-Bosch process.</span>
The equation of 5m+4=7m+6 is equal to m=-1
