David drives and slows to a stop when he sees a stop sign. A graph of his velocity over time is shown below.
What is his average acceleration from to seconds?
Answer using two significant figures.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide