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kolezko [41]
3 years ago
6

A circle has a circumference of 452.16 units. What is the radius of the circle?

Mathematics
1 answer:
Elena-2011 [213]3 years ago
7 0

Answer:

72

Step-by-step explanation:

It's 72

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Let y′′′−9y′′+20y′=0. find all values of r such that y=erx satisfies the differential equation. if there is more than one correc
DerKrebs [107]

we are given

differential equation as

y'''-9y''+20y'=0

we are given

y=e^{rx}

Firstly, we will find y' , y'' and y'''

those are first , second and third derivative

First derivative is

y'=re^{rx}

Second derivative is

y''=r*re^{rx}

y''=r^2e^{rx}

Third derivative is

y'''=r^2*re^{rx}

y'''=r^3e^{rx}

now, we can plug these values into differential equation

and we get

r^3 e^{rx}-9r^2 e^{rx}+20re^{rx}=0

now, we can factor out common terms

e^{rx}(r^3 -9r^2 +20r)=0

we can move that term on right side

(r^3 -9r^2 +20r)=0

now, we can factor out

r(r^2 -9r +20)=0

r(r-5)(r-4)=0

now, we can set them equal

r=0

r-5=0

r=5

r-4=0

r=4

so, we will get

r=0,4,5...............Answer

4 0
3 years ago
Y = -1.33 * X - 3 Show your work
Aleksandr [31]
Y = -1.33 * x - 3
y = -1.33 -3 *x
y = -4.33 *x
8 0
3 years ago
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Carly spend 10 hours a day working at her job what percentage of her day does she spend at work ?
AlladinOne [14]
10/24 x 100 = 41.66
Approximately 42% of her day
3 0
3 years ago
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Given that f(x) = x² + 3x 28 and g(x) = x + 7, find f(x) + g(x) and
ozzi

Answer:

f(x) + g(x) = x^2 + 4x + 35

Step-by-step explanation:

Add like terms from f(x) and g(x):

f(x) + g(x) = x^2 + 3x + 28 + x + 7, or

f(x) + g(x) = x^2 + 4x + 35

7 0
2 years ago
Algebra 1 Question Brainliest given
agasfer [191]
D hope this helps :) good luck
4 0
3 years ago
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