3 years ago

I need help for number 49

Mathematics

1 answer:

Dmitry_Shevchenko [17]3 years ago

8 0

I'm thinking it's B for that question

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The order of magnitude for the population of the world is five. true or false?

pochemuha

The Order of magnitude for the population of the world is not five

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3 years ago

Write a sentence that<br> represents the equation,<br> 5x + 3=28.

cupoosta [38]

Answer:

five times a number of pencils plus three pencils =twenty-eight pencils.

Step-by-step explanation:

x = 5, Have a great day!

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2 years ago

Find a solution x = x(t) of the equation x′ + 2x = t2 + 4t + 7 in the form of a quadratic function of t, that is, of the form x(

Temka [501]

The particular quadratic solution to the ODE is found as follows:

$x=at^2+bt+c$
$x'=2at+b$

$(2at+b)+2(at^2+bt+c)=t^2+4t+7$
$2at^2+(2a+2b)t+(b+2c)=t^2+4t+7$

$\begin{cases}2a=1\\2(a+b)=4\\b+2c=7\end{cases}\implies a=\dfrac12,b=\dfrac32,c=\dfrac{11}4$

Note that there's also the fundamental solution to account for, which is obtained from the characteristic equation for the ODE:

$x'+2x=0\implies r+2=0\implies r=-2$

so that $x_c=Ce^{-2t}$ is a characteristic solution to the ODE, and the general solution would be

$x=Ce^{-2t}+\dfrac{t^2}2+\dfrac{3t}2+\dfrac{11}4$

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3 years ago

The area of a rectangle is represented by x^2-5c-14. What are the dimensions?

jekas [21]

The dimensions are factors of the expression
... you multiply them together to get the area

the factors are ... (x - 7) & (x + 2)

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There are three children in a family. a friend is told that at least two of them are boys. what is the probability that all thre

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It would be 33.333333% Likely to be a boy or a girl.

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3 years ago