Y+9=1/7(x-5) in general form

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

What is the average rate of change for this function for the interval from x=2 to x=4 ?

17 in long 1.3 ft wide and 8in high what is the volume