List multiples to find the lcm of 27 and 45

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

The perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap