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Firlakuza [10]
3 years ago
6

Can someone answers these quickly I have a soccer game today and I want to finish this :(

History
1 answer:
soldi70 [24.7K]3 years ago
7 0

Answer:

10.

So from 3:16; 16/3=5.33 (recurring) then to solve for the mass of zinc you divide 320 by 5.33 (recurring) to give you 60g which is the mass of the zinc

12.

a. The equation is y = 19 x

b. The height of 13 DVD cases is 247 mm

Explanation:

<u>12.</u>

- 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.

-We need to find the height of 13 DVD cases

∵ y = 19 x

∵ x = 13

- 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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