Please help me solve this and explain the steps well because I literally don’t know anything about this x-2-5x=-34

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9