S=16t^2 if t=3 So you would plug it in 16(3)^2 Then you multipy 16*3^2 =144 It is easier if you use a calculator just type in ti 30 calculator online that should help
<span>It will take 20 minutes. The fridge needs to cool down by 90-50=40degrees. The fridge cools at 2 degrees per minute, i.e. 40/2=20 minutes total.</span>
