I'm not 100% sure but this is how I would try.
If you don't get a better answer, check this w/your teacher.
x/100 *90,000 = 1200
90,000x = 120,000
x = 1.3% tax percentage
1.3/100x = 2200
1.3x = 220,000
x = $169,230.77 assessed value
A title could be the effect of the amount/number of days on the amount/number of bacteria. For the 2nd The IV is temperature, the DV is Enzyme Activity and a title could be The effect of Temperature on Enzyme activity.
Straight lines will always add up to 180 degrees, so the angle that is missing here is supplementary to the other angle(adds up with the other angle to get 180) so we take 79 away from 180 and get 101 degrees
The answer in simplest form would be 2 and 3 fifths gallons of gas.
