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olya-2409 [2.1K]
2 years ago
11

Tara would like to finish 2/5 of her book by next Friday.If the book has 203 pages,about how many pages does she need to read?

Mathematics
2 answers:
Sonja [21]2 years ago
7 0
2/5 of 100 is 40, multiply that by two and you get 80/200. 80 pages. 
mariarad [96]2 years ago
4 0
To get the answer we can use proportion
2/5 ------------------ 203
3/5 ------------------ x
crossmultiply now
3/5*203=2/5*x
\frac{609}{5} = \frac{2}{5} x \\ 609=2x \\ x=304.5 - its the answer
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a_ny^(n)+\dots+a_1y'+a_0y=0

assume solution of a form, e^{yt}

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Simplify to,

e^{yt}(y^3-y^2+4y-4)=0

Then find solutions,

\underline{y_1=1}, \underline{y_2=2i}, \underline{y_3=-2i}

For non repeated real root y, we have a form of,

y_1=c_1e^t

Following up,

For two non repeated complex roots y_2\neq y_3 where,

y_2=a+bi

and,

y_3=a-bi

the general solution has a form of,

y=e^{at}(c_2\cos(bt)+c_3\sin(bt))

Or in this case,

y=e^0(c_2\cos(2t)+c_3\sin(2t))

Now we just refine and get,

\boxed{y=c_1e^t+c_2\cos(2t)+c_3\sin(2t)}

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3 years ago
What is the radius of a sphere with a volume of 1/6 pie
Yakvenalex [24]

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Substitute:

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3 years ago
If 3* = 54, then which of the following must be true?
motikmotik

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Step-by-step explanation:

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