Question 55854
Double check your book for the given terms.  Since 1970 is the first year, it should be the 0 value.
{{{ p =  4903000 * 1.0047t }}}
t=0 is 1970
t=10 is 1980
t=20 is 1990
Plug 10 in for t
{{{ p =  4903000 * 1.0047t }}}
{{{ p =  4903000 * 1.0047(10) }}}
Multiply
{{{ p =  4903000 * 10.047 }}}
Multiply again
{{{ p = 4926044.1 }}}
Assuming that t=10 for 1980 ... this is the population.