Step-by-step explanation:
let the cost of the item be y
for taxes
30%of y
30/100×y=3y/10
=0.3y
freight charges =65
total =520
0.3y+65=520
0.3y=520-65
0.3y=455
y=455/0.3
y=$1516.7
y≈$1517
Newton's Law of Cooling
Tf=Ts+(Ti-Ts)e^(-kt) where Tf is temp at time t, Ts is temp of surroundings, Ti is temp of object/fluid. So we need to find k first.
200=68+(210-68)e^(-10k)
132=142e^(-10k)
132/142=e^(-10k)
ln(132/142)=-10k
k=-ln(132/142)/10
k≈0.0073 so
T(t)=68+142e^(-0.0073t) so how long until it reaches 180°?
180=68+142e^(-0.0073t)
112=142e^(-0.0073t)
112/142=e^(-0.0073t)
ln(112/142)=-0.0073t
t= -ln(112/142)/(0.0073)
t≈32.51 minutes
Answer:
2.9
Step-by-step explanation:
It just is
Answer:
260
Step-by-step explanation:
28+29(23)
=28+(29)(8)
=28+232
Answer:
Step-by-step explanation:
um i no but i can not tell u
