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3 years ago

Write 4.239.x10^6 in decimal form

Mathematics

2 answers:

kaheart [24]3 years ago

8 0

The answer is 4,239,000 but I don’t know what you mean by decimal form.

xxMikexx [17]3 years ago

5 0

Answer:

4.239

Step-by-step explanation:

4,239,000 is 4.239 × 1,000,000 which is the same as 4.239×10^6

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3 years ago

Find the area of the circle r = 3 ft

pav-90 [236]

Answer:

9π ft² or approximately 28.26 ft²

Step-by-step explanation:

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Plug 3 in for the radius.

A=π(3²)

A=9π ft²,

or using 3.14 for pi,

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2 years ago

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2 years ago

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Verify by substitution whetherthe given functions are solutions of the given DE. Primes denote derivatives with respect to x.y!!

julia-pushkina [17]

Complete Question

The complete question is shown on the first uploaded

Answer:

$y_1$ is not a solution of the differential equation

$y_2$ is not a solution of the differential equation

$y_3$ is not a solution of the differential equation

Step-by-step explanation:

The differential equation given is $y'' + y' = cos2x$

Let consider the first equation to substitute

$y_1 = cosx +sinx$

$y_1' = -sinx +cosx$

$y_1'' = -cosx -sinx$

$y_1'' - y_1' = -cosx -sinx -sinx +cosx$

$y_1'' + y_1' = -2sinx$

$-2sinx \ne cos2x$

This means that $y_1$ is not a solution of the differential equation

Let consider the second equation to substitute

$y_2 = cos2x$

$y_2' = -2sin2x$

$y_2'' = -4cos2x$

$y_2'' + y_2' = -4cos2x-2sin2x$

$-4cos2x-2sin2x \ne cos2x$

This means that $y_2$ is not a solution of the differential equation

Let consider the third equation to substitute

$y_3 = sin 2x$

$y_3' = 2cos 2x$

$y_3'' = -4sin2x$

$y_3'' + y_3' = -4sin2x - 2cos2x$

$-4sin2x - 2cos2x \ne cos2x$

This means that $y_3$ is not a solution of the differential equation

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2 years ago