Questions on Algebra: Divisibility and Prime Numbers answered by real tutors!

450 divided by 270

Here are two ways:

First way:

      1 
270)450
    270
    180

 =  = 

Second way:



Since both end with a 0, they can both be divided by 10, so:



To divide by 10, just drop off the 0's on the end and you get



Now if we remember our 9's multiflication facts, we
remember that 5×9 = 45 and 3×9 = 27, so



and you get



Then you change that to a mixed number and get:



Edwin

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3 - look at figure 3. The difference in times for p waves and s waves to reach the seismograph is increasing as distance from earthquake to seismograph increases. At 10,000 km it's somewhere around 12 minutes, so for 10,500 km it's certainly at least 12. Those lines are not going to suddenly converge. The only valid answer is d.

4 - Examine figure 2 and figure 3. The earthquake begins, then those waves move and are detected by the seismographs at different distances from the focus. Figure 3 begins at 0 km distance from the focus, 0 minutes after the earthquake. That's when the earthquake happens, or starts at the focus. The answer is f.

6 - Examine figure 2. Note that the top color is lake clay, and its height shows elevation which is also the thickness of that layer. Where is the top color thinnest? The answer is at Winnepeg Manitoba.

7 - Examine figure 3. The smallest oxygen isotope ratio is at the left of each site chart. It shows that at the top (smaller ----------> larger). In each case, it's between 20 and 30 m. That's c.

8 - The top gray layer is the lake clay. The second layer, with the diagonal lines, is glacial till. Clay gets wider/thicker moving left from Grand Forks to Site 3. The glacial till gets thinner moving left from Gran Forks to Site 3. It's decreasing. That's J.

10 - For all three sites the y-axis is depth. 3M is the right most dot in each table. It's at about -15 in each case. That's J.

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