Diana usually drives at average rate of 30 mph. If Diana drives with the average rate x mph, how long would it take her to get to Tony's house?

12/x hours

Step-by-step explanation:

d=12

s*t=d

t=d/s

t=12/s

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the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.  

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take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.