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2 years ago

Does anyone notice or know why is brainly dead for many days??

Mathematics

1 answer:

ziro4ka [17]2 years ago

8 0

Answer:

what do you mean dead its not breathing

Step-by-step explanation:

someone help ambulance we want CPR

brainly is dead

haha sorry i was just joking hehe (≧∇≦)

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Nine less than a number z

Vsevolod [243]

So your number is z and you want 9 less z-9

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2 years ago

Read 2 more answers

What is the area of the trapezoid? someone please help its due in a few mins

alex41 [277]

Answer:

47.5

Step-by-step explanation:

by using this formula: A=(a+b)/2 x h

8 0

2 years ago

HELP!!!! I can’t figure this out

grin007 [14]

Answer:

$A.\,\orange{ \bold{ \frac{x - 3}{3x + 1} }}$

Step-by-step explanation:

$\frac{x + 2}{ {x}^{2} + 5x + 6 } \div \frac{3x + 1}{ {x}^{2} - 9} \\ \\ = \frac{x + 2}{ {x}^{2} + 3x + 2x+ 6 } \div \frac{3x + 1}{ {x}^{2} - {(3)}^{2} } \\ \\ = \frac{\cancel{x + 2}}{ \cancel{{({x}+ 3)}} \cancel{(x+ 2) }} \times \frac{\cancel{( {x} + 3)}( {x} - {3)}}{3x + 1} \\ \\ = \purple{ \bold{ \frac{x - 3}{3x + 1} }}$

5 0

2 years ago

lauren bikes 1 1/3 mi in 1/10 hour. what is her rate of speed in miles per hour? *Will give brainliest*

joja [24]

Answer:

13 1/3 miles per hour

Step-by-step explanation:

Take the distance and divide by the time

1 1/3 ÷ 1/10

Change to an improper fraction

4/3 ÷ 1/10

Copy dot flip

4/3 * 10/1

40/3 miles per hour

changing to a mixed number

13 1/3 miles per hour

5 0

2 years ago

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 259.2-cm and a standard dev

Varvara68 [4.7K]

Answer:

The probability that the average length of rods in a randomly selected bundle of steel rods is greater than 259 cm is 0.65173.

Step-by-step explanation:

We are given that a company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 259.2 cm and a standard deviation of 2.1 cm. For shipment, 17 steel rods are bundled together.

Let $\bar X$ = the average length of rods in a randomly selected bundle of steel rods

The z-score probability distribution for the sample mean is given by;

Z = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\mu$ = population mean length of rods = 259.2 cm

$\sigma$ = standard deviaton = 2.1 cm

n = sample of steel rods = 17

Now, the probability that the average length of rods in a randomly selected bundle of steel rods is greater than 259 cm is given by = P( $\bar X$ > 259 cm)

P( $\bar X$ > 259 cm) = P( $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ > $\frac{259-259.2}{\frac{2.1}{\sqrt{17} } }$ ) = P(Z > -0.39) = P(Z < 0.39)

= 0.65173

The above probability is calculated by looking at the value of x = 0.39 in the z table which has an area of 0.65173.

8 0

3 years ago

Does anyone notice or know why is brainly dead for many days??​

Does anyone notice or know why is brainly dead for many days??