in 1990 there were about 5.4 billion people in the world. if the population has been growing at 1.95% per year, estimate the yea
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<h2>>> Answer </h2>
__________
a² = c² - b²
a² = 9² - (√65)²
a² = 81 - 65
a² = 16
a = √16
a = 4