<p>opps. Sorry for my mousie hand in the middle of the graph :p</p>
<p>Is the answer three?</p>
<p>Yep!</p>
<p>How did you get that… ;o</p>
<p>the one actual period where it goes down shows that the population goes UP but the rate goes DOWN. Hence it is three</p>
<p>You just want to compare the rate of the solid line and the rate of the dashed line.</p>
<p>They want to know how many times the rate of the solid line was greater than the rate of the solid line in the same interval.</p>
<p>Rate = Slope </p>
<p>So, an easy way to do this problem is to use intuition.</p>
<p>To determine in how many intervals the slope of the solid line was MORE POSITIVE than the slope of the dashed line.</p>
<p>For example, between 1880 and 1900, the slope of the solid line was more steep (more positive) compared to the dashed line. </p>
<p>But then between 1960 and 1980, the slope of the solid line was less sleep than the slope of the dashed line, i.e. a less drastic rate of change.</p>
<p>More positive slope = greater rate of change</p>
<p>Yeah, it’s 3. 1880-1900, 1900-1920, 1940-1960.</p>
<p>OHHH.</p>
<p>I misread then. I thought it was asking which 20 year interval is greater than the constant one.</p>
<p>Thanks everyone! :)</p>