Here’s the first few and you can do the rest with the same principles. If you need more help with the last ones then let me know
X equals 7.1 if you round to the nearest tenth
That's a 33% increase.
I calculated this using the formula:

Where n = the new value (16 in your question), o = the old value (12 in your question) and the result is outputted as a percent increase. You can check that this is correct by finding 33% of 12, adding the result to 12, and checking that the result equals your "new" number.
Note that 33% is only an approximation as your question requires a number rounded to the nearest whole.
Answer:
13
Step-by-step explanation:
Answer: 13/15
Step-by-step explanation: