SOLUTION: I can't seem to wrap my mind around how to round an equation at the end of a problem.
Here is the problem: and below I will show my work. The online assistant equates the answer
Algebra.Com
Question 208087This question is from textbook Intermediate Algebra for College Students
: I can't seem to wrap my mind around how to round an equation at the end of a problem.
Here is the problem: and below I will show my work. The online assistant equates the answer to 13hours That is where I am stuck I am not sure how to come up with that answer.
Problem:
T(x) = 510/x+55 + 230/x+70
The steps I have taken:
1: 510(x+70)/(x+55)(x+70) + 230(x+55)/(x+55)(x+70)
2: 510(x+70)+230(x+55)/(x+55)(x+70)
3: (510x+35700)+(230x+12650)/(x+55)(x+70)
4: 740x+48,350/(x+55)(x+70)
5: 10(74x+4,8350)/(x+55)(x+70)
6: replace x with t(0) 10(74(0)+4835)/(0+55)(0+70)
Now I am supposed to round this. The answer is T=13 Im not sure how to get from step 6 to the answer please help!
Thanks in advance.
Chris
This question is from textbook Intermediate Algebra for College Students
Found 3 solutions by jim_thompson5910, checkley77, rapaljer:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
What are your complete instructions? Are you plugging in x=0 and evaluating for T? If you are, then you're not going to get T=13 as an answer. So are you supposed to plug in some other value of x? Or are you trying to solve for x? You need to post the whole problem (including the question/instructions).
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
1: 510(x+70)/(x+55)(x+70) + 230(x+55)/(x+55)(x+70)
2: 510(x+70)+230(x+55)/(x+55)(x+70)
3: (510x+35,700)+(230x+12,650)/(x+55)(x+70)
4: 740x+48,350/(x+55)(x+70)
5: 10(74x+4,835)/(x+55)(x+70)
6: replace x with t(0) 10(74(0)+4,835)/(0+55)(0+70)
7: 10*4,835/3,850=48,350/3,850=12.558 ROUNDING UP TO 13.
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
T(x) = 510/x+55 + 230/x+70
If all you need is T(0), then you did NOT need to do all those steps! In the original expression, substitute x=0, and you get
T(0) = 510/(0+55) + 230/(0+70)
T(0) = 510/55 +230/70
Use a calculator and I get 12.558, which rounds up to 13.
R^2
Dr. Robert J. Rapalje
RELATED QUESTIONS
I cant seem to wrap my head around this problem to even begin solving, maybe im just... (answered by Fombitz)
If a cone is 110' across and 13' deep, what is the diameter at 7' deep? I do all the... (answered by chen)
Thank you so much nerdybill for helping me with my previous problem, Question 169324. I... (answered by Alan3354)
I am really struggling with this one problem because I can’t just seem to wrap my head... (answered by Alan3354)
A landscaper wants to enclose a 90 ft by 120 ft rectangle with a walk of uniform width.... (answered by Targetweek)
Hi, I homeschool my son so please don't assume I'm a student asking for help. I... (answered by mananth)
Suppose a bike rider climbs a mountain at 10km/hr and decends the mountain at 50km/hr.... (answered by Alan3354)
This is a word problem I am struggling with: You've been offered a part time job at a... (answered by venugopalramana)
HERE AT WORK I AM TRYING TO SOLVE THIS PROBLEM AND ITS HURTIN MY HEAD! PLEASE HELP. I AM... (answered by stanbon)