What part of slope-intercept form is the rate of change"?

Write the expression 7x^3-28xy^2 as the product of 3 factors

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse. a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?

Percent increase and decrease. original number: 45 new number: 18