3 years ago

Brian has an upcoming track meet in two weeks. In Preparation for the meet, Brian ran 3 and %

Mathematics

1 answer:

Softa [21]3 years ago

5 0

Answer: 12.35 miles

3.5+2.75+6.1=12.35

I hope this is good enough:

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Evaluate the expression 4a^2 - 2b ÷ 4 for a = 2 and b = 4.

Alexxandr [17]

(4a² -2b)/4
(4(2)² - 2×4)/4
(16-8)/4
8/4
= 2

please don't forget to give my answer brainliest if they are correct

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2 years ago

Help I will give brainless tell me the numbers in order

Blababa [14]

-2: y = -2-2 = -4
-1: y= -1 - 2 = -3
0: y = 0 - 2 = -2
1: y = 1 - 2 = -1
2: y = 2 - 2 = 0

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2 years ago

Bernoulli differential equation... y'+xy=xy^2

snow_lady [41]

$y'+xy=xy^2\implies y^{-2}y'+xy^{-1}=x$

Let $z=y^{-1}$ , so that $z'=-y^{-2}y'$ . Then the ODE becomes linear in $z$ with

$-z'+xz=x\implies z'-xz=-x$

Find an integrating factor:

$\mu(x)=\exp\left(\displaystyle\int-x\,\mathrm dx\right)=e^{-x^2/2}$

Multiply both sides of the ODE by $\mu$ :

$e^{-x^2/2}z'-xe^{-x^2/2}z=-xe^{-x^2/2}$

The left side can be consolidated as a derivative:

$\left(e^{-x^2/2}z\right)'=-xe^{-x^2/2}$

Integrate both sides with respect to $x$ to get

$e^{-x^2/2}z=e^{x^2/2}+C$

where the right side can be computed with a simple substitution. Then

$z=1+Ce^{x^2/2}$

Back-substitute to solve for $y$ .

$y^{-1}=1+Ce^{x^2/2}\implies y=\dfrac1{1+Ce^{x^2/2}}$

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3 years ago

Carmen draws this area model to help her divide 1,800 by 9. She says the quotient is 20. Does Carmen's model make sense? Use the

earnstyle [38]

Answer:

Yes

Step-by-step explanation:

Her answer makes sense because 1800 ÷ 9 is 20

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3 years ago

Express 9.54 as a mixed number

shepuryov [24]

9 27/50
Good luck !!

5 0

3 years ago