Which graph represents a bike traveling at a constant rate of 12 miles per hour

Line graph

Explanation:

a line graph will represent a bike traveling at a constant rate of 12 miles per hour starting at 12miles along y-axis and ending at 12miles

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!

Well, a and b together would be negative. b alone would also be negative.