What does it mean for a line to be a perpendicular bisector of a side of the triangle

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 ?

What is the absolute value of the complex number -4-sqrt2i

Abcd is a square. what is the measure of angle bac