Choose the best interpretation for the slope.
a. the slope indicates the mean weight.
b. the slope indicates the mean change in miles per gallon for an increase of 1 pound in weight.
c. the slope indicates the ratio between the mean weight and the mean miles per gallon.
d. the slope indicates the mean miles per gallon.
e. it is not appropriate to interpret the slope because it is not equal to zero.

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)