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Nezavi [6.7K]
3 years ago
13

Please help me i really need help please help me

Mathematics
1 answer:
Lapatulllka [165]3 years ago
5 0

Answer:

The total surface is 48 ft

Step-by-step explanation:

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The height of a stack of DVD case is proportional to the number of case in the stack. The height of 6 DVD case is 114mm.
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Answer:

a. The equation is y = 19 x

b. The height of 13 DVD cases is 247 mm

Step-by-step explanation:

- A proportional relationship is about two quantities vary directly with

 each other

- Ex: If y proportion to x, then y is varies directly with x

  That means y ∝ x ⇒ y = k x, where k is the constant of variation

- The height of a stack of DVD case is proportional to the number of

  case in the stack

- That means the height of DVD cases varies with the number of cases

- The height of 6 DVD case is 114 mm

a.

∵ The number of cases = x

∵ The height of the cases = y

∴ y ∝ x

∴ y = k x

- To find k lets use the first information above

∵ y = 114 mm when x = 6

- Substitute these values in the equation above to find k

∵ 114 = 6 k

- Divide both sides by 6

∴ k = 19

- Substitute the value of k in the equation above

∴ y = 19 x

* The equation is y = 19 x

b.

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∵ y = 19 x

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- Substitute the value of x in the equation

∴ y = 19 × 13

∴ y = 247 mm

* The height of 13 DVD cases is 247 mm

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