Question

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Answer 1

answer should be : 420/p

Answer 2

`w=(420)/(p)`

Explanation:

So generally a direct proportion can be expressed as:

`k=(y)/(x)`

essentially where the y/x is equal to some constant value.

Whenever you have an inverse proportion, you can generally express it as:

`k=xy`

where the product of x and y is equal to some constant value.

So we can check for inverse proportion, by seeing if the xy product is constant

1 * 420 = 420

2 * 210 = 420

3 * 140 = 420

Since the xy (or technically wp, or in general the product of the independent variable and dependent variable) product is constant, this relationship can generally be expressed as:
`wp=420`

We can divide both sides by p, so we can isolate the dependent variable (p)

`w=(420)/(p)`