How many different passwords can be created where the first two spaces are letters, the next two spaces are number digits, and the last two spaces are either $, % or &. [repeats are allowed]

x-3y=4

step-by-step e

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

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?