4 km/day x 180 days x 1000 m/km = 720,000 meters
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(6x - 5)(2x + 5) assuming you missed a minus sign....
Assuming that you answered 45 questions and got the other 43 right, that would be 96 percent.
Her average speed was 10 m/s. You probably missed something in the question, there isn't enough there to determine "how much it increased by".
Full points minus the stuff you missed.
20 questions missed out of 140 leaves 85.71%.