6 out of 20=what percent?
6/20=x%
percent means parts out of 100
x%=x/100
6/20=x/100
time both sides by 100
30=x
answer is 30% passed
100-30=70
70% is answer
13.5/3 = 4.5
He hiked for 4.5 hours.
Answer:
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Step-by-step explanation:

When there is a (-) in front of an expression in parentheses, change the sign of each term in the expression:

Collect like terms


Calculate

Hope this helps...
Good luck on your assignment...
The 3r would be the independent variable and m=30 is the dependent variable. Double check the answer though.