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Oxana [17]
3 years ago
8

1) 9f - 2 - 8f 2) -8 (-2-5z) + 7 3) 8r - r 4) 2-8k-6k 5) (-2r-6) 6) b+8b

Mathematics
2 answers:
Shalnov [3]3 years ago
6 0
1) f-2
2)23+40z
3)7r
4)2-14k
5)-2r-6
6)9b
kipiarov [429]3 years ago
6 0
1) subtract 9f and -8f = f - 2

2) factor 8 with the numbers in the parenthesis and then sum 7 with 16
16 + 40z + 7 = 23
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The average of 6 numbers is 7. When a 7th number is addedThe average of all numbers is 0. What is the seventh number?
Katena32 [7]

-- The average of 6 numbers is 7.
    So those 6 numbers must add up to 42.

-- If one more number results in an average of zero,
   the new number must be  -42 .
   Then all 7 numbers add up to zero.
4 0
2 years ago
Grasshoppers are distributed at random in a large field according to a Poisson process with parameter a 5 2 per square yard. How
HACTEHA [7]

In this question, the Poisson distribution is used.

Poisson distribution:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

In which

x is the number of sucesses

e = 2.71828 is the Euler number

\mu is the mean in the given interval.

Parameter of 5.2 per square yard:

This means that \mu = 5.2r, in which r is the radius.

How large should the radius R of a circular sampling region be taken so that the probability of finding at least one in the region equals 0.99?

We want:

P(X \geq 1) = 1 - P(X = 0) = 0.99

Thus:

P(X = 0) = 1 - 0.99 = 0.01

We have that:

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

P(X = 0) = \frac{e^{-5.2r}*(5.2r)^{0}}{(0)!} = e^{-5.2r}

Then

e^{-5.2r} = 0.01

\ln{e^{-5.2r}} = \ln{0.01}

-5.2r = \ln{0.01}

r = -\frac{\ln{0.01}}{5.2}

r = 0.89

Thus, the radius should be of at least 0.89.

Another example of a Poisson distribution is found at brainly.com/question/24098004

3 0
3 years ago
Please ASAP please
Mars2501 [29]

Answer:

A)3.125hr

B)53.325mi

Step-by-step explanation:

speed=distance/time

an hour and 15min=1.25hr

32/1.25=25.6mi/hr

80/25.6=3.125hr

B)

2hr and 5min=2+5/60=2.083hr

2.083x25.6=53.325mile

7 0
2 years ago
Please Help!!!
marishachu [46]
The second one, and you as well ☺️
8 0
3 years ago
What is the length of the diagonal of a rectangle whose width is 100 centimeters and whose length is 180 centimeters. ( round th
Aloiza [94]
D                                              keep trying for your family

5 0
3 years ago
Read 2 more answers
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