By writing each number correct to one significant figure, estimate the value of​ 21.86-9.64÷2.47​

The right answer is "12.22". A further explanation is provided below in the explanation segment.

Explanation:

The given expression is:

⇒  21.86 - 9.64 ÷ 2.47​

By using the BODMAS (Bracket of division, multiplication, addition and subtraction) rule,

On applying division, we get

=  

=  

On applying subtraction, we get

=  

compare & contrast informative essay/speech

when speaking or writing for the sole purpose of providing information in order to give audience members a good basis for making a decision, you would present an informative speech or essay.   because you wouldn’t want to be persuading the audience by arguing for one type of exercise over the other, you wouldn’t choose a persuasive/argumentative technique.   to fairly, and without bias, present information about the pros and cons of each type exercise, a compare/contrast, informative speech/essay would be the best bet.