Some airlines offer telephones for passengers. On one airline, the cost of a phone call to the ground is $2 + $2 per minute, charged at the beginning of each minute.
a. how much does it cost the instant your phone call is made?
b. how much does it cost after 30 seconds?
c. do you think cost is a function of time? why or why not.
2006-11-15 13:42:21 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The slope-intercept equation, y=mx+b is what you need. Two dollars is the intercept, that is to say, what you are charged when the number of minutes, x, is zero. The number of minutes is multiplied by the slope, m, which is also two dollars.
So the equation which will pop out the answers is cost=$2.00(mimutes) + $2.00. The same as y=2x+2.
a. the instant the call is made, the charge is $4.
b. after 30 seconds its $4.
c.cost is a function of time, plus the constant charge of $2 for just making a call ( the intercept, b). This is a linear function in x.
EDIT
if cost per minute is charged at the beginning of each minute, then b. is $4, because you aren't charged for 30 sec, you are charged for that whole minute. And a. would also be $4 because you are getting into that first minute.
2006-11-15 13:50:30 · answer #1 · answered by Anonymous · 0⤊ 0⤋
a. $4
b. $4
c. Yes. As each new 60sec time frame passes, you are accruing $2 in charges.
2006-11-15 21:50:47 · answer #2 · answered by G 2 · 0⤊ 0⤋
if i told you than what would you do with your home work time
and would that not be cheating .
surelyyou want to grow up a clever and honourable person ,
I will not be the one to rob you of that chance.
good luck
2006-11-15 21:50:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋
a. $2
b. $2
c. Yes, because the cost is directly related to time. As x (the time) increases, y (the cost) also increases.
2006-11-15 21:46:24 · answer #4 · answered by J3Buckets 2 · 0⤊ 1⤋
a.$4
b.$4
c.idk
2006-11-15 21:44:31 · answer #5 · answered by ilovemydogii 4 · 0⤊ 0⤋