Answer
a) $1.728 *10^{11}$ blood cells per day
b) $1.2 * 10^6$ seconds; 13.88 days
Work Step by Step
a)
$2*10^6$ per second
$2*10^6*3600$ per 3600 seconds
$2*10^6*3600*24$ per 3600*24 seconds
$48*10^6*3600$ per 24 hours
$48*10^6*3600$ per day
$172800*10^6$ per day
$1.728 *10*10*10*10*10*10^6$ per day
$1.728 *10^5*10^6$ per day
$1.728 *10^{11}$ per day
b)
$2.4*10^{12}/2*10^6$
$2.4/2 * 10^{12}/10^6$
$1.2 * 10^6$
$1.2 * 10^6$ seconds
$1.2 * 10^6/3600$ per 3600 seconds
$1.2 * 10^6/3600$ per hour
$1.2 * 10^6/3600*24$ per 24 hours
$1.2 * 10^6/86400$ per day
$1.2 * 10^6/8.64 *10000$ per day
$1.2*10^6/8.64 * 10^4$ per day
$1.2/8.64 * 10^6/10^4$ per day
$.13888 *10^2$
$13.88$ days