How does uncertainty relate to measurements and calculations made during an investigation? There is uncertainty in each measurement, as indicated by significant figures.
There is uncertainty in each count of items used in a procedure.
There is no uncertainty in an answer calculated using significant figures.
There is no uncertainty if the best equipment is used correctly.

there here is your answer to your question

Uncertainty in measurements and calculations means difference between actual and measured data. We can say that all measurements have some degree of uncertainty. ... Systematic error (because of error in measuring instrument) 2. Random error (human errors such as- delay in starting, delay in stopping).

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

it would be kevlar ^^