Since these questions all require similar methods of solving, I will only completely work out the first question of each type.
2. To find 

as a decimal, all we need to do is complete the fraction by dividing the numerator by the denominator.

 = 7 / 10 = 0.7
 as a decimal is 0.7
 as a decimal is 0.7.
3. To write a fraction as a percentage, we must first convert it into a decimal, the way we did in problem 2.

Then to change that number into a percentage, we can either multiply it by 100, or (my personal shortcut) just shift the decimal point over two places to the right.
0.65 = 65%
which is the answer to question 3.
 written as a percent is 65%
 written as a percent is 65%.
4. Writing a percentage as a fraction is a bit easier than writing a fraction as a percentage. All you need to do is place the percentage in the numerator's place of a fraction with 100 as the denominator and simplify. 
2%5 = 

Since 25 goes into 100 four times, we can simplify this fraction.

which is our answer.
25% written as a fraction is 
.
5. This is the same as problem 3, so I won't show my work for the sake of time.
 as a percentage is 40%
 as a percentage is 40%.
6. This is the same as problem 1, so I will not show steps again.
 as a decimal is 0.15
 as a decimal is 0.15.
7. Done similar problems in past. No work shown.
 as a percent is 42%
 as a percent is 42%. 
8. Same as last problem.
 as a percent is 4%
 as a percent is 4%.
9. Same as number 4.
 6% as a fraction is 
.
10. Similar in past.
 as a percentage is 60%
 as a percentage is 60%.
11. Same as 6.
 as a decimal is 0.48
 as a decimal is 0.48.
12. Done a lot of these so far.
 as a percentage is 30%
 as a percentage is 30%. 
13. Just did one like this.
 as a percentage is 75%
 as a percentage is 75%.
14. Same as 4 and 9.
65% as a fraction is 
.
15. Plenty of these done in past.
 as a percentage is 20%
 as a percentage is 20%.
16. Last problem, and it's just like the one just before this.
 written as a percent is 90%
 written as a percent is 90%.
So there are the results.
Hope that helped! =)