select the two representations that are functions. A. {(0.9), (3,12), (-5,10), (5,10)} B. these are tables it goes like X:10, -1 , 10, 8 -2 Y: 5, 8, -5, -9. -4 C. y=x^2 + 10 D. X^2 + y^2 = 25

i need more details sorry

step-by-step explanation:

how many friends does he have? i think some of the information got cut off in the problem.

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?