<span>x^2+8x-20=0
Factor the left side of the equation
</span><span><span>(x−2)</span><span>(x+10)</span></span>=<span>0
</span>
Set the factors to both equal the number 0
<span><span>x−2</span>=<span><span><span>0
and/or
</span>x</span>+10</span></span>=<span>0
</span>x = 2 and/or x = -10
Answer:
Arithmetic density
Explanation:
Physiological density calculates the amount of people per arable (of land used or suitable for growing crops) square kilometer of land. Arithmetic density is the amount of people per square kilometer of land.
Try https://www.sciencedaily.com/terms/water_pollution.htm or https://www.britannica.com/science/water-pollution
Go to https://phs-year9.wikispaces.com/Group+4-+Tsunami%27s