I didn’t learn to do this please help

What values of c and d make the equation true?

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

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 ?