Write a two-step equation from the verbal model. Four times a number and eight is twenty
a
4x + 8 = 21
b 4x + 8 = 12
с
42 - 8 = 20
d 4x +8= 20

no idea

step-by-step explanation:

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?

answer: graphs are something you write or draw and equations are math problems