3 years ago

Three times a number is 4 more than twice the number

Mathematics

1 answer:

Gelneren [198K]3 years ago

5 0

Answer:

3n = 2n + 4

Step-by-step explanation:

That is that as an equation.

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When the area in square units of an expanding circle is increasing twice as fast as its radius in linear units

alexira [117]

Answer:

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Step-by-step explanation:

Area of the circle is defined as:

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Derivating both sides

$\frac{dA}{dr}$ =2πr

$\frac{dA}{dt}$ = $\frac{dA}{dr}$ x $\frac{dr}{dt}$ = 2πr $\frac{dr}{dt}$

If area of an expanding circle is increasing twice as fast as its radius in linear units. then we have : $\frac{dA}{dt}$ =2 $\frac{dr}{dt}$

Therefore,

2πr $\frac{dr}{dt}$ = 2 $\frac{dr}{dt}$

r=1/π

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