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3 years ago

Please, Please, Please help.

Mathematics

1 answer:

Vitek1552 [10]3 years ago

8 0

Answer:

1. E and D

Step-by-step explanation:

Most people at LEAST got 2 hours of exercise

More people played video games then exercising

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What is the area of this face?

tino4ka555 [31]

28

Beak the face into three shapes one 10x2 and then two small squares 2x2 each

20+4+4=28

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3 years ago

Which situation can be modeled by the inequality 48−10x≥8?

kenny6666 [7]

Answer:

A. You have $48 to spend on socks, but you need to save at least $8 to pay for the bus trip home. You plan to spend the rest on socks at $10 each (including tax).

Step-by-step explanation:

cause it's A

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3 years ago

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Consider the system of differential equations dx/dt=−2y dy/dt=−2x. . Convert this system to a second order differential equation

Musya8 [376]

Answer:

Step-by-step explanation:

we have the following differential equations

$\frac{dx}{dt}=-2y\\\frac{dy}{dt}=-2x\\$

by differentiating the second equation we have

$\frac{d}{dt}(\frac{dy}{dt})=-2\frac{dx}{dt}\\\frac{d^{2}y}{dt^{2}}=-2\frac{dx}{dt}\\\frac{dx}{dt}=\frac{-1}{2}\frac{d^{2}y}{dt^{2}}$

and we replace dx/dt in the first equation

$\frac{-1}{2}\frac{d^{2}y}{dt^{2}}=-2y\\\frac{d^{2}y}{dt^{2}}-4y=0$

and by using the characteristic polynomial

$m^{2}+4=0\\m=\±2i$

the solution is

$y(t)=Acos(2t)+Bsin(2t)$

and to compute x(t) we have

$\frac{dx}{dt}=-2Acos(2t)-2Bsin(2t)\\\\\int dx = \int[-2Acos(2t)-2Bsin(2t)]dt\\\\x(t)=-Asin(2t)+Bcos(2t)$

and if we use x(0)=4 and y(0)=3, we can calculate the constants A and B

$x(0)=B=4\\y(0)=A=3$

I hope this is useful for you

regards

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3 years ago

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K divided 3=9<br><br><br> Help me

Anastaziya [24]

Answer:

Step-by-step explanation:

If k/3 = 9

K must be 27

because 9*3=27

and to check we can do

27/3

and 27/3 = 7

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3 years ago

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Find the unit rate. Round to the nearest hundredth, if necessary.<br> $1.99 for 15lb

Oksanka [162]

Answer:

0.13 cents

Step-by-step explanation:

1.99 / 15 = 0.1326, rounded is 0.13

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3 years ago