If a water meter reading one month went from 321,017 units to 320,405 units, how many units of water were used during the month?

Me because some of question i don’t understand

What are the solutions to the equation 4x2+3x=24-x

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?