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3 years ago

7. If P = [5,6,7,8). Q = (2,4,6,8) andR=2, 3, 7, 9), then P nQnR=

Mathematics

2 answers:

Setler [38]3 years ago

7 0

Answer:

pnQnR= {}

Step-by-step explanation:

there is no number common in set P, set Q and set R.

So the answer is null

{}

valentina_108 [34]3 years ago

3 0

Answer:

{} there is no number common to the three sets so it is an empty set

Step-by-step explanation:

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Two college roommates have each committed to donating to charity each week for the next year. The roommates’ weekly incomes are

schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

$S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36$

To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

$z=\frac{S-\mu_S}{\sigma_S} =\frac{120-90}{22.36}=\frac{30}{22.36}=1.34\\\\P(S>120)=P(z>1.34)=0.09012$

The expected weeks can be calculated as the product of the number of weeks in the year (52) and this probability:

$E=\#weeks*P(S>120)=52*0.09012=4.68$

The nearest answer is C. 5 weeks.

6 0

3 years ago

Please help me!! solve 31 = x + 25.5

serious [3.7K]

Answer:

x = 5.5

General Formulas and Concepts:

Pre-Algebra

Equality Properties

Step-by-step explanation:

Step 1: Define

31 = x + 25.5

Step 2: Solve for x

Subtract 25.5 on both sides: 5.5 = x
Rewrite: x = 5.5

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3 years ago

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Sarah is conducting a science experiment. The directions tell her to mix 5 parts of substance A with every 3 parts of substance

ANEK [815]

15 = 3 parts
15 divided by 3 = 5
5 = 1 part
A calls for 5 parts
5 • 5 = 25
Answer: 25 Milliliters

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3 years ago

WILL GIVE BRAINLY AND POINTS PLZZZ Which linear function has a positive slope?

melamori03 [73]

Answer:

The third option has a linear slope.

Step-by-step explanation:

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3 years ago

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ANWER PLEASE FIRST TO ANSWER GETS BRAINLEST ANSWER

mamaluj [8]

I believe the answer is C 1,300

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3 years ago

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7. If P = [5,6,7,8). Q = (2,4,6,8) andR=2, 3, 7, 9), then P nQnR=​

7. If P = [5,6,7,8). Q = (2,4,6,8) andR=2, 3, 7, 9), then P nQnR=