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Digiron [165]
2 years ago
8

A bag is filled with marbles. You take out and mark 80 marbles. Then you put the marbles back in the bag and mix the marbles. In

a sample of 20 marbles, 4 of the marbles are marked. About how many marbles are in the bag?

Mathematics
2 answers:
evablogger [386]2 years ago
7 0
There are about 400 marbles
noname [10]2 years ago
3 0
About 400 marbles. You simply set up a proportion and solve it as I did in the photo attached.

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Heyy!!
rosijanka [135]

<u>Answer:</u>

6^{10}

<u>Step-by-step explanation:</u>

We can use the following rule of surds to solve the problem:

\boxed{a^m \times a^n = a^{m + n}},

which means that when multiplying two numbers with the same bases, we can simply add their powers while keeping the base the same.

Applying this rule:

6^2 \times 6^8

⇒ 6^{2 + 8}

⇒ \bf 6^{10}

8 0
1 year ago
En un triángulo rectángulo A es un ángulo agudo y Sen A = 4/5 ¿Cuál será el valor de Tan A?
Nonamiya [84]

Answer:

\displaystyle \tan A=\frac{4}{3}

Step-by-step explanation:

<u>Funciones Trigonométricas</u>

La identidad principal en trigonometría es:

sen^2A+cos^2A=1

Si sabemos que A es un ángulo agudo (que mide menos de 90°), su seno y coseno son positivos.

Dado que Sen A = 4/5, calculamos el coseno:

cos^2A=1-sen^2A

Sustituyendo:

\displaystyle cos^2A=1-\left(\frac{4}{5}\right)^2

\displaystyle cos^2A=1-\frac{16}{25}

\displaystyle cos^2A=\frac{25-16}{25}

\displaystyle cos^2A=\frac{9}{25}

Tomando raíz cuadrada:

\displaystyle cos\ A=\sqrt{\frac{9}{25}}=\frac{3}{5}

La tangente se define como:

\displaystyle \tan A=\frac{sen\ A}{cos\ A}

Substituyendo:

\displaystyle \tan A=\frac{\frac{4}{5}}{\frac{3}{5}}

\displaystyle \tan A=\frac{4}{3}

6 0
2 years ago
How many labeled points are between points B and U?<br><br><br><br> four<br> zero<br> two<br> seven
blondinia [14]
Your answer is four love!
5 0
2 years ago
Help, these are yes or no answers.
djverab [1.8K]

Answer:

7:yes

8:no

9:yes

10:sorry

Step-by-step explanation:

3 0
2 years ago
A pair of numbers that can be used to locate a point on a coordinate plain
Blizzard [7]

Answer:

(5,2)

Step-by-step explanation:

6 0
2 years ago
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