Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 5 hours. Together they charged a total of $1350. What was the rate charged per hour by each mechanic if the sum of the two rates was $165 per hour?
first mechanic: $_ per hour
Second mechanic: $_per hour

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

If a || b and e || f , what if the value of y ?