<span> <span><span> <span> <span> <span><span> <span> This is easy all you have to do is fill in the chart on the pdf. here I did it but you have to fill it in on your own. So just go from left to right starting at the top and fill it in, all except the dates which I didn't do.Hope this helped :)<span>
<span><span>
<span> Date, </span>
<span>
High, Temperature
</span>
<span>
Subtract current temperature minus previous temperature,</span><span>Difference, </span>
<span>
Low Temperature, </span>
<span>
Subtract current temperature minus previous temperature, </span>
<span>
Difference, </span>
</span>
<span>
<span>
</span>
<span>
93, </span>
<span>
-N/A-, </span>
<span>
-N/A- ,</span><span>
87, </span>
<span>
-N/A-, </span>
<span>
-N/A-, </span>
</span>
<span>
<span>
</span>
<span>
90 ,</span><span>
93-90=, </span>
<span>
-3 ,</span><span>
79, </span>
<span>
79-87, </span>
<span>
-8 ,</span></span><span><span>
</span>
<span>
93, </span>
<span>
93-90, </span>
<span>
3, </span>
<span>
81 ,</span><span>
81-79, </span>
<span>
2 ,</span></span><span><span>
</span>
<span>
91 ,</span><span>
91-93, </span>
<span>
-2 ,</span><span>
81 ,</span><span>
81-81, </span>
<span>
0, </span>
</span>
<span>
<span>
</span>
<span>
91, </span>
<span>
91-91, </span>
<span>
0, </span>
<span>
79, </span>
<span>
79-81, </span>
<span>
-2, </span>
</span>
<span>
<span>
</span>
<span>
95, </span>
<span>
95-91, </span>
<span>
4 ,</span><span>
79 ,</span><span>
79-79, </span>
<span>
0 ,</span></span><span><span>
</span>
<span>
95, </span>
<span>
95-95, </span>
<span>
0, </span>
<span>
79, </span>
<span>
79-79, </span>
<span>
0.</span></span></span></span><span><span><span><span><span><span><span><span> </span> <span> </span></span><span> </span> </span></span></span></span> </span></span></span></span> </span></span></span></span> </span></span>
So the number of ways of choosing two distinct letters at a time is (42)=6. We can then add the duplicate pairs which are O,O and N,N to give a total of 8 possible pairs.
