I am afraid this is a tricky question; a telephone call costs $.45 for the 1st min. plus $.40 additional min.?

Question

what is the linear equation?
I have = 0.45 + 0.40x am I correct??

Answer 1

Nearly

Total cost = $0.45 + $0.40(x - 1)
Where x is the number of minutes in your call

If the first minute is more expensive, then the entire call minus that first minute is at $0.40. So the time at $0.40 is (x - 1).

Your equation would express a flat fee (connection fee, for example) of $0.45, plus a cost of $0.40 per minute for the actual call (including the first minute)

Answer 2

If y is the cost of the call, then y = 0.45 + 0.40(x-1). This way it's actually "45 cents for the first minute (x=1), and "40 cents each additional minute" (the initial 0.45 plus 0.40 for every x > 1). In theory, you could say this simplifies to y = 0.05 + 0.40x.

Note though that the true graph wouldn't be continuous. You're not billed by fractions of a minute, only time rounded up to the nearest minute. Likewise, if you haven't called (x=0) you're not charged anything. But the graph works fine for whole values of x greater than or equal to 1.

Now if there was a 1-900 number that could trick people into being charged an EXPONENTIAL rate instead of a linear rate...man, they'd clean house.

Answer 3

The Telephone Call Cost

= 0.45 + 0.40x for x greater than 1 min

or

= 0.45 for x less than or equal to 1 min

OR


= 0.45 + 0.40(x-1)

Expanding,

= 0.45 + 0.40x - 0.40

= 0.05 + 0.40x

The later is a better answer.

Note x = 1, 2, 3, 4, ...

There is a problem if x = 0 (you have to pay 5 cents even if you did not make a call.)

Answer 4

Tom is right the other two people are wrong.

If a call is 5 minutes, the first minute is .45 and the next 4 are each .40 so it should be 2.05

Let x = number of minutes
let c = cost
c=.45+.40(x-1) is the answer
c=.45+.40(5-1)
c=.45+.40(4)
c=.45+1.60
c=2.05

if we did it with your formula
c = .45 + .40x
c = .45 + .40(5)
c = .45 + 2.00
c = 2.45
wrong

Answer
c=.45+.40(x-1)

Answer 5

The linear equation is 0.45 + 0.40x where x is the number of minutes NOT INCLUDING the first minute.

So if it sez 10 minutes then x=9

Answer 6

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Answer 7

yes you're correct =0.45+0.40x (x means number of succeeding minutes)

Answer 8

no, u r not
it should be0.45 + 0.40(x-1)

Answer 9

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