Autotrophic organisms are able to take inorganic molecules and transform them into organic nourishment by using light or chemical energy. why are autotrophic organisms considered essential to all other life on earth?

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

Nine more than four times a number is the same as one less than twice the number. find the number?

What is the distance between point a and b