Question 1011421
10,000=Po{1+0.07}^t, where Po is the amount needing to be placed in the trust account.
ln of both sides
9.2103=ln Po+t ln(1.07); t=12 for the oldest child
9.2103-12ln(1.07)=8.3984.  Don't round yet,
now take e of both sides
e^8.3984-e^(lnPo)=Po
$4440.12
===========same for the other child, only t=14
$3878.17