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3 years ago

I need help fast!!!! 20 points and brainliest to whoever gets it right

Mathematics

2 answers:

Alexandra [31]3 years ago

3 0

Answer:

rational numbers - 5.01212121212..., -5/250, √400

irrational numbers - √1000, ∛30, 0.01562138411...

Explanation:

rational numbers are any numbers that can be expressed as a ratio. whole numbers and integers are also counted as rational numbers.

5.01212121212... is a recurring number, which means that it can be written as a fraction. therefore, it is a rational number.

√1000 cannot be expressed as a fraction, which makes it an irrational number.

∛30 cannot be expressed as a fraction, so it is irrational.

-5/250 is a fraction, making it a rational number.

0.01562138411..., also cannot be expressed as a fraction since it is a non-terminating number. it is irrational.

√400 = 20, which is a whole number, thus it is rational.

i hope this helps! :D feel free to comment if you need to ask me anything.

Ann [662]3 years ago

3 0

Answer:

Imma just tell you

Step-by-step explanation:

The one above is so precise and right! There is no way of me beating that explanation, so Imma tell ya'll- THE ONE ABOVE THIS ONE IS ABSOLUTELY CORRECT! ~ Thank you

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12 and 1/2 + 1 and 5/8

ki77a [65]

Answer: 14 1/8

Step-by-step explanation: To add mixed numbers, first add the fractions. In this case, we have two fractions $\frac{1}{2}$ and $\frac{5}{8}$ and these fractions have unlike denominators. We need to find a common denominator for both of these fractions to be able to add.

<u>Least Common Denominator:</u>

$\frac{1}{2}$ = $\frac{4}{8}$

$\frac{5}{8}$ = $\frac{5}{8}$

12 4/8 + 1 5/8 = 13 9/8

Notice that 9/8 is an improper fraction so we can change it to a mixed number.

9/8 = 1 1/8

13 + 1 and 1/8 = 14 1/8

3 0

2 years ago

It takes 20 minutes for 5 people to paint 5 walls.

cestrela7 [59]

Answer

it would take 41 minutes to paint the wall

6 0

2 years ago

Read 2 more answers

Let c be the curve of intersection of the parabolic cylinder x2 = 2y, and the surface 3z = xy. find the exact length of c from t

Mandarinka [93]

Parameterize the intersection by setting $x(t)=t$ , so that

$x^2=2y\iff y=\dfrac{x^2}2\implies y(t)=\dfrac{t^2}2$
$3z=xy\iff z=\dfrac{xy}3\implies z(t)=\dfrac{t^3}6$

The length of the path $C$ is then given by the line integral along $C$ ,

$\displaystyle\int_C\mathrm dS$

where $\mathrm dS=\sqrt{\left(\dfrac{\mathrm dx}{\mathrm dt}\right)^2+\left(\dfrac{\mathrm dy}{\mathrm dt}\right)^2+\left(\dfrac{\mathrm dz}{\mathrm dt}\right)^2}\,\mathrm dt$ . We have

$\dfrac{\mathrm dx}{\mathrm dt}=1$
$\dfrac{\mathrm dy}{\mathrm dt}=t$
$\dfrac{\mathrm dz}{\mathrm dt}=\dfrac{t^2}2$

and so the line integral is

$\displaystyle\int_{t=0}^{t=2}\sqrt{1^2+t^2+\dfrac{t^4}4}\,\mathrm dt$

This result is fortuitous, since we can write

$1+t^2+\dfrac{t^4}4=\dfrac14(t^4+4t^2+4)=\dfrac{(t^2+2)^2}4=\left(\dfrac{t^2+2}2\right)^2$

and so the integral reduces to

$\displaystyle\int_{t=0}^{t=2}\frac{t^2+2}2\,\mathrm dt=\dfrac{10}3$

3 0

3 years ago

1. −2x + 6 = -16<br> 2. -10 + 5x = -45<br> Can you help me?

torisob [31]

I just know that 2 is X = 6

8 0

2 years ago

Read 2 more answers

John's sister is twice his age. In 5 years the sum of their ages will be 31. How old are John and his sister now? Briefly explai

evablogger [386]

Like usual, we can solve this question using an equation. Let’s assume that John’s age is x, and his sister’s age is y.

x = 2y

To figure out John’s age, we need to know his sister’s age. He’s 2 times older than his sister.

x + y = 27

The sum of their ages is 27, and we can substitute the value of x here to figure out y.

2y + y = 27

We can now simplify this, and get y by itself.

3y = 27

Now, we can divide by 3 to get the y by itself.

y = 9

We now know that John’s sister is 9.

Now, using our original equation, we can substitute in the value of y.

x = 2(9)

We can simplify this.

x = 18

John’s age is 18!

Hope this helps.

3 0

3 years ago