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answer:How often does El Niño occur? El Niños usually occur irregularly, approximately every two to seven years. Look at the El Niños and La Ninas from 1950 to the present in this time series plot of the multivariate ENSO index from NOAA ESRL.
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1.The only difference is: If you multiply or divide both sides of an equation by the same negative number, the equation remains the same, but If you multiply or divide both sides of an inequality by the same negative number, the inequality reverses.
2.The reason extraneous solutions exist is because some operations produce 'extra' answers, and sometimes, these operations are a part of the path to solving the problem. When we get these 'extra' answers, they usually don't work when we try to plug them back into the original problem