Homework Help: math correction

Posted by jasmine20 on Tuesday, January 9, 2007 at 7:42pm.

can someone correct this for me.Also do i have to solve it all the way or what does it mean by inequality form.

Business and finance. The cost for a long-distance telephone call is $0.36 for the first minute and $0.21 for each additional minute or portion thereof. Write an inequality representing the number of minutes a person could talk without exceeding $3.
Let x = be the number of minutes:
The first minute cost $0.36
The remaining x –1 minutes cost $0.21 each
So the remaining x- 1 minutes altogether costs $0.21 (x – 1)

Total cost = $0.36 + $0.21 (x – 1)

This must be less than or equal $3.00. So we have:
$0.36 +$0.21 (x- 1) <= $ 3.00
Multiply through by 100 and drop the $’s
36 + 21(x –1)<= 300
12 + 7 (x –1) <=100 (In this step in order to get this equation I had to divide both sides by 3 to make the numbers smaller.)
12 + 7x – 7 <= 100
7x + 5 <= 100

math correction - Kad, Wednesday, September 26, 2007 at 6:56pm
You already solved the answer...
36 + 21(x –1)<= 300 is the answer to writing an inequality representing the number of minutes a person can make with 3 bucks.
- math - vanessa, Tuesday, November 6, 2007 at 7:58pm
  i need help on correcting my work
math correction - cooi16, Tuesday, March 29, 2011 at 5:58pm
The melt in your mouth chocolate factor opens its doors each day at 7:00am sharp. Sally arrived at the factory 10 minutes before the door opened. Luke got their 18 minutes after sally, but 4 minutes before Michelle. At what time did Michelle arrive at the factory?
math correction - kyle, Thursday, October 18, 2012 at 2:07pm
write 5760 as a product of primes

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