Posted by Ashley on .
The power in an electric circuit varies inversely with the resistance. If the power is 1200 watts when the resistance is 12 Ohms, find the power when the resistance is 6 Ohms.

Algebra 
Anonymous,
A taxi company charges riders a fixed charge of $2.30 plus $1.20 per mile. How many miles must a rider go to have an average cost per mile of $1.30?

Algebra (Anon.) 
PsyDAG,
First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.
Let n= # miles
2.30 + 1.20n = 1.30n 
Physics Ashley needs help 
PsyDAG,
Indicate your subject in the "School Subject" box, so those with expertise in the area will respond to the question.

Physics Ashley needs help 
PsyDAG,
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.

Algebra actually :) 
Damon,
p = k/R
1200 = k/12
k = 14400
so
p = 14400/6
p = 2400 Watts 
Algebra Anon 
Damon,
c = 1.2 m + 2.3
c/m = 1.2 + 2.3/m = 1.3
2.3/m = 0.1
m = 23 miles 
Algebra 
najat,
when P=1200W , R=12Ù
the current is I^2=P/R=100 , I=10A
So the power P=? R=6Ù I=10A
P=I^2R= 100*6=600W