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2 years ago

Someone help Im lost:(

Mathematics

1 answer:

Aleks [24]2 years ago

8 0

Answer:

DBE = 20 FBC=30 andd ABF=150

Step-by-step explanation:

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which geometric instrument would i use to measure the length of a segment, the compass or the straightedge?

viva [34]

Straightedge i think

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3 years ago

Find a particular solution to y" - y + y = 2 sin(3x)

leonid [27]

Answer with explanation:

The given differential equation is

y" -y'+y=2 sin 3x------(1)

Let, y'=z

y"=z'

$\frac{dy}{dx}=z\\\\d y=zdx\\\\y=z x$

Substituting the value of , y, y' and y" in equation (1)

z'-z+zx=2 sin 3 x

z'+z(x-1)=2 sin 3 x-----------(1)

This is a type of linear differential equation.

Integrating factor

$=e^{\int (x-1) dx}\\\\=e^{\frac{x^2}{2}-x}$

Multiplying both sides of equation (1) by integrating factor and integrating we get

$\rightarrow z\times e^{\frac{x^2}{2}-x}=\int 2 sin 3 x \times e^{\frac{x^2}{2}-x} dx=I$

$I=\frac{-2\cos 3x e^{\fra{x^2}{2}-x}}{3}+\int\frac{2x\cos 3x e^{\fra{x^2}{2}-x}}{3} dx -\int \frac{2\cos 3x e^{\fra{x^2}{2}-x}}{3} dx\\\\I=\frac{-2\cos 3x e^{\fra{x^2}{2}-x}}{3}+\int\frac{2x\cos 3x e^{\fra{x^2}{2}-x}}{3} dx-\frac{2I}{3}\\\\\frac{5I}{3}=\frac{-2\cos 3x e^{\fra{x^2}{2}-x}}{3}+\int\frac{2x\cos 3x e^{\fra{x^2}{2}-x}}{3} dx\\\\I=\frac{-2\cos 3x e^{\fra{x^2}{2}-x}}{5}+\int\frac{2x\cos 3x e^{\fra{x^2}{2}-x}}{5} dx$

8 0

2 years ago

the temperature of an oven went through 330 degrees to 390 degrees what is the percentage increase in temperature

valentina_108 [34]

All you do is divide.
330/390= 0.846
round it: 0.85
Answer is about 85%

5 0

3 years ago

Sue is collecting eggs and she wants to sell them in egg cartons that hold a dozen eggs. If she collects 75 eggs, how many full

Setler [38]

Answer:

she would have 6 egg cartons to sell and 3 eggs left over (:

Step-by-step explanation:

75 divided by 12 equals 6.25

12 times 6 equals 72

75 minus 72 equals 3

egg cartons- 6

left over eggs-3

Hope this helps (:

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2 years ago

Find the probability of being below 514 if the mean of a normal distribution is 474 and the standard deviation is 32.

Aleonysh [2.5K]

I think it is c not sure tho

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3 years ago