The variable z varies jointly with x and y. Also, z = -75 when x = 3 and y = -5. What equation describes this variation?

What is the constant of variation?
k =
When x = 1 and y = –2, z =

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?