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alina1380 [7]
2 years ago
14

The replacement times for DVD players are normally distributed with a mean of 7.1 years and a standard deviation of 1.5 years (d

ata from Consumer Reports). What is the probability that a randomly selected DVD player will be replaced in less than 5 years?  
  In a city, it is estimated that the maximum temperature in June is normally distributed with a mean of 23º and a standard deviation of 5°. Calculate the probability of having a maximum temperature between 20° and 28°.
Mathematics
1 answer:
Nikitich [7]2 years ago
6 0

branily.com//Httpstesxt

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REALLY NEED ALGEBRA HELP please
lisabon 2012 [21]
A. The discriminant is 81. The formula is b^2 - 4ac.

B. 2 answer and both will be rational due to the fact that the discriminant is a perfect square. 

C. Solutions are 1/2 and -4. You can find using the quadratic formula. 
8 0
3 years ago
What is the simplified form of 30 times x to the sixth power over 14 times y to the fifth power times the fraction 7 times y-squ
Sonbull [250]
If we convert the given in its mathematical form, we have,

                      (30x⁶/14y⁵)(7y²/6x⁴)
It can be observed that the numerator of the first and the denominator of the second have a common factor of 6x⁴. Also, the denominator of the first and the numerator of the second expression have a common factor of 7y².

                      ((6x⁴)(5x²)/(7y²)(2y³))(7y²/6x⁴)

Cancellation of the common terms will give us an answer of,
  
                               <em>5x²/2y³

</em>
<em />Therefore, the simplified version of the involved operation is 5x²/2y³. <em>
</em>
6 0
3 years ago
Perform the indicated operation.
Tasya [4]

Answer:

-22

Step-by-step explanation:

-18 - 4 =

We are subtracting both number so add them and then give them a negative sign

-( 18+4)

-22

5 0
3 years ago
Beyonce's private jet can fly 1800 miles in 2 hours at a constant speed.
lukranit [14]

Answer:

im not too sure but my best guess would be

D= 900×T

D= the constant of proportionality multiplied by time to get how many miles traveled.

if the hours given were 1 hour 2 hours & 3 hours

if you multiplied them by 900 you would get the distanced traveled

900 x 1 = 900 miles traveled in one hour

900 ×2 = 1800 miles traveled in 2 hours

sounds good ?

6 0
3 years ago
The temperature started at 89°F. If the temperature went up 6°F and then down 12°F, whats is the temperature difference relative
marysya [2.9K]

B

C.

B

These are the answers

6 0
3 years ago
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