Which inequality has the solution of
{ x| x > 3 or x < -3}

a.) |2x| > 6

b.) |2x| < 6

c.) |2x| _> 6

d.) |2x| _< 6

(imagine the lines are under the less than or greater than signs

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.

are you missing something?

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answers

\3. yes the presentation (i.e. odd numbers being written as differences of two squares) is possible for all odd natural number however the presentation may not be unique. for example,  57=112−82=292−28257=112−82=292−282.

\4. 2 can't be written as a difference of two squares because 4-1=3 and 1-1=0 and the difference of squares grows to integers larger that 3.

can i get some in proving questions 1 and 2?