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Linear Algebra 8 Online
OpenStudy (jskinny0831):

You have the choice of logging on at one of two Internet cafés. Their posted rates are as follows: Log-On Café: $6.25 plus $0.25 for every minute online eCafé: $7.00 plus $0.20 for every minute online Which café is the best option if you plan on using the Internet for 55 minutes? What is the equation that relates the number of minutes used and the total cost, and how much money will you save?

RhondaSommer (rhondasommer):

so we will use X for minutes and write equations for each cafe

OpenStudy (anonymous):

Log-On Cafe will be $20.00 For 55 Minutes online. eCafe will be $18 for 55 minutes online. eCafe will have the best plan for 55 minutes online. The equaton will be $7.00 + $0.20(55)=$18.00. You will save $2.00 by choosing eCafe. Hope I was able to help!

OpenStudy (jskinny0831):

A. Log-On Café, the equation is C = $0.25M + $6.25 ,and I'll save $0.75 B. Log-On Café, the equation is C = $0.625M + $2.50, and I'll save $2.00 C. eCafé, the equation is C = $0.70M + $2.00, and I'll save $0.75 D. eCafé, the equation is C = $0.20M + $7.00, and I'll save $2.00

OpenStudy (jskinny0831):

@RhondaSommer

OpenStudy (jskinny0831):

which would be the answer

RhondaSommer (rhondasommer):

we will work through it together

OpenStudy (jskinny0831):

okay thanks

OpenStudy (jskinny0831):

i tried doing it myself and picked B but i just wanna make sure if its right

RhondaSommer (rhondasommer):

for C- were was 0.7 anywhere?

OpenStudy (jskinny0831):

idk I'm honestly confused

RhondaSommer (rhondasommer):

there is no 0.7 anywhere in the equation

OpenStudy (jskinny0831):

no there wasn't

OpenStudy (jskinny0831):

so i guess that ones not the answer

RhondaSommer (rhondasommer):

in the problem* so c cant be the answer

OpenStudy (jskinny0831):

yeah thats true

RhondaSommer (rhondasommer):

now for b- is 2.50 anywhere in the problem?

OpenStudy (jskinny0831):

oh no it isn't

RhondaSommer (rhondasommer):

so it cant be B

OpenStudy (jskinny0831):

2.50 is no where in the question

OpenStudy (jskinny0831):

so is it D?

RhondaSommer (rhondasommer):

hold on. we will see

OpenStudy (jskinny0831):

okay so whats the next step

RhondaSommer (rhondasommer):

the equations in A and D are correct. so place 55 for M and solve.

RhondaSommer (rhondasommer):

(in both) and see which one is less; and by how much.

OpenStudy (jskinny0831):

in the format y=mx+b?

RhondaSommer (rhondasommer):

yep

OpenStudy (jskinny0831):

what numbers can i use?

OpenStudy (jskinny0831):

for X

RhondaSommer (rhondasommer):

but dont graph it. Log-On Café, the equation is C = $0.25M + $6.25 eCafé, the equation is C = $0.20M + $7.00 put 55 in for M

OpenStudy (jskinny0831):

ohhhhhh okay i gotchu

RhondaSommer (rhondasommer):

C is the cost for each.

RhondaSommer (rhondasommer):

yeah :)

OpenStudy (jskinny0831):

20 for the first and 18 for the second

OpenStudy (jskinny0831):

18 is less by 2

RhondaSommer (rhondasommer):

so ecafe and less by 2 :)

OpenStudy (jskinny0831):

so its D?

RhondaSommer (rhondasommer):

d is correct :)

OpenStudy (jskinny0831):

thank you!! you really helped

RhondaSommer (rhondasommer):

no problem

RhondaSommer (rhondasommer):

one last thing

OpenStudy (jskinny0831):

what?

RhondaSommer (rhondasommer):

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OpenStudy (jskinny0831):

awww thank you haha

RhondaSommer (rhondasommer):

:)

OpenStudy (jskinny0831):

and can you still help for other questions

RhondaSommer (rhondasommer):

yeah

OpenStudy (jskinny0831):

okay so i got a couple wrong so i retook it but idk why if i did good on the practice questions

OpenStudy (jskinny0831):

Because of a recent rise in the stock market, a market analyst is trying to determine whether to apply a linear model or an exponential model. During the first 4 days of week 5, MyStock prices closed at the following values: MyStock Price (week 5) Day Price 1 $61.00 2 $103.70 3 $176.29 4 $299.69 Does the increase in price represent linear or exponential growth, and what is the constant growth rate or growth factor per day?

OpenStudy (jskinny0831):

A. Linear, and the constant growth rate is $43.70 per day B.Linear, and the growth factor is 1.7 per day C.Exponential, and the growth factor is 1.7 per day D.Exponential, and the constant growth rate is $43.70 per day

OpenStudy (jskinny0831):

hello ? @RhondaSommer

OpenStudy (jskinny0831):

can you help me @jaybraley

RhondaSommer (rhondasommer):

you're supposed to post it in a new question and then tag me. so do that please

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