3 years ago

I NEED HELP!!! AYUDA!! AIDEZ-MOI!!!

Mathematics

2 answers:

MrRissso [65]3 years ago

6 0

Should be 28 respond if I’m wrong

saul85 [17]3 years ago

4 0

Angle f would be 28°

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A school plans the weekly reading activities. They have 18 storys books, which is 4 books more than 2 times that of science book

Morgarella [4.7K]

Answer:

$Number\ of\ science\ books=7$

Step-by-step explanation:

$Let\ number\ of\ science\ books=x\\\\Story\ books=18\\\\2\times science\ books+4=Story\ books\\\\2x+4=18\\\\Subtract\ 4\ from\ both\ the\ sides\\\\2x+4-4=18-4\\\\2x=14\\\\Divide\ both\ sides\ by\ 2\\\\\frac{2x}{2}=\frac{14}{2}\\\\x=7\\\\Number\ of\ science\ books=7$

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3 years ago

PLEASE HELP ASAP!!!

arlik [135]

$\text{Plug in 3 to y and solve:}\\\\4(3)^3-20+9(3)^2+(25 \div5)\\\\4(27)-20+9(3)^2+(25 \div5)\\\\4(27)-20+9(9)+(25 \div5)\\\\4(27)-20+9(9)+5\\\\108-20+81+5\\\\88+86\\\\174\\\\\boxed{\text{A). 174}}$

4 0

4 years ago

Read 2 more answers

If dy/dx=2xy^2 and y(-1)=2, find y(2)

Amiraneli [1.4K]

This is a separable first order differential equation as an initial value problem.

$\dfrac{dy}{dx} =2xy^2$

Divide both sides by y².

$\dfrac{1}{y^2}\dfrac{dy}{dx}=2x$

Multiply both sides by dx.

$\dfrac{1}{y^2} dy=2x \times dx$

Integrate both sides.

$\int \dfrac{1}{y^2} dy= \int 2x \times dx$

$- \dfrac{1}{y}=x^2+C$

Multiply both sides by -1

$\dfrac{1}{y}=-x^2+C_1$
(where $C_1=-C$ )

Now, isolate y on one side of the equation.

$y=\dfrac{1}{-x^2+C_1}$

That's the general solution. Now, plug in the value x=-1 and y=2.

$2=\dfrac{1}{C_1-1}$

$C_1=3/2$

The final solution is the following:

$y=\dfrac{1}{-x^2+3/2}$

I hope this helps! If you need any clarifications, feel free to comment! :)

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4 years ago

Someone pls help me out

pashok25 [27]

B. Is the right answer :)

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4 years ago

Circles A and B have centers (−5,−2) and (4, 4), respectively. Both circles have a radius of 1. Which of the following transform

kykrilka [37]

Answer:

translastion

Step-by-step explanation:

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3 years ago