Andy and Bob took a test that had 120 problems. Andy got 30 more problems correct than Bob. The number of problems that only Andy got correct is six times the number of problems that both boys got correct. There are 20 problems that neither boy got correct. How many problems did both boys get correct?

12r - 8 - 12

you have to combine like terms. below i have bolded the like terms:

12r - 8 - 12

together it combines to:

12r - 20

hope this !

the answer, i believe is y-8=1(x+4)

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 is c chief it always is