A, four way switches have the word" on" engravedon their hand<em><u>l</u></em><em><u>e</u></em><em><u>s</u></em>
Environment is something very important today, because it is becoming more and more polluted. People do harm without being aware that they destroy the world. People just want more and more money and more and more destruction, which is definitely the cause, yet people do not know the effect that it can cause. Without explaining the effect that pollution can cause, today's environment cannot be explained. Shortly, by being greedy (the cause), we destroy our habitat (the effect)
John will need to sleep for 10.3 hours before his second exam so that the
average of his two exam scores is an 80.
We were given
8 hours of sleep = 70
To get average of 80
<u>70+ x</u> = 80
2
Cross multiply:
70+x = 160
x= 160-70
= 90.
If 8 hours of sleep = 70
x hours of sleep = 90
Cross multiply
8× 90 = 70 × x
720 = 70x
x = 720/70
x = 10.2857
≈ 10.3 hours of sleep
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