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Korvikt [17]
3 years ago
5

Dalila bought her grandma a music album for $12.50 and then ordered three songs for herself. In total (before tax), she spent $1

6.37.
How much did Dalila spend on each song?

Mathematics
1 answer:
Shalnov [3]3 years ago
3 0
For the 1st question this answer is C
16.37= 12.50 + 3p
Dalila spent $1.29 dollars on each song
hope this helped :)
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Answer:

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Step-by-step explanation:

(a) You are given two points, (d, C) = (360, 342) and (780, 426). The two-point form of the equation for a line can be helpful.

... y = (y2 -y1)/(x2 -x1)(x -x1) +y1

Using the given points and variables, ...

... C = (426 -342)/(780 -360)(d -360) +342

... C = (84/420)(d -360) +342

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... C = 0.20·1800 +270 = 360 +270 = 630

(c) The slope of the curve is (change in dollars)/(change in miles) = $/mile, the cost of each mile driven. (It is $0.20 per mile.)

(d) The C-intercept is C(0) = cost for 0 miles driven. (It is $270.)

(e) Both your own experience and the problem statement tell you that the cost of vehicle operation varies with miles driven. If nothing else, you need to pay more for gas the farther you drive.

(In real life, you don't expect the model to be exactly linear, becasue you get a large jump in cost when you reach certain maintenance interval miles: 15,000, 30,000, and so on.)

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