-3x from both sides so it looks like 2x=20 and divide by 2 and x=10
1-
number 2) is correct
2- 3) is true
11) Jacob is not correct. because 6radical 5 is irrational
12) radical 20 is an irrational number but
so a+b is irrational
but

so b+c is rational
good luck
Answer:
you use older of operations to solve this