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Php exponential equation

Php exponential operator

$z = pow(2, 8); 	// int(256)
$z = $x ** $y;		// raises $x to the $y'th power  PHP >= 5.6

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Php exponential equation

$e=exp(1);
$yIntercept=.050;
$pow=-4.23E-10;
$m= $pow*$x;
$prediction=$yIntercept*pow($e,$m);

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