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alexdok [17]
3 years ago
6

Johnni guessed on all 8 questions of a multiple-choice quiz. Each question has 4 answer choices. What is the probability that sh

e got exactly 3 questions correct? Round the answer to the nearest thousandth.
A. 0.004
B. 0.208
C. 0.422
D. 0.792
Mathematics
1 answer:
Ne4ueva [31]3 years ago
3 0

Answer: The answer is B. 0.208.

Step-by-step explanation: Just took the test on e2020

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X = <img src="https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B3%7D" id="TexFormula1" title="\frac{2}{3}" alt="\frac{2}{3}" align="absmi
jok3333 [9.3K]

x = -15

Step-by-step explanation:

x =  \frac{2}{3} x - 5

Collect like terms and simplify

x -  \frac{2}{3} x =  - 5 \\  \frac{1}{3} x =  - 5

Cross multiply

x =  - 5 \times 3 \\  \\ x =  - 15

6 0
3 years ago
Chris is going on holiday to the united states of america the exchange rate is £1=$1.55 chris has £720 spending money how much d
nekit [7.7K]

Answer:

1,116 USD

Step-by-step explanation:

1=1.55 that is a 55% increase. 55% of 720 is 396. 720+396=1,116 USD

8 0
3 years ago
More help please !!!
butalik [34]

Answer:

(-2, 1).

Step-by-step explanation:

The x coordinates are -1 and -3 and the y coordinates are 4 and -2.

So the midpoint is (-1 + -3)/2,  ( 4 + -2) / 2

=  (-4/2, 2/2)

= (-2, 1).

4 0
3 years ago
Read 2 more answers
Find a closed form for the generating function for each of these sequences. (assume a general form for the terms of the sequence
noname [10]
There really is no single "obvious" choice here...

Possibly the sequence is periodic, with seven copies of -1 followed by six copies of 0, or perhaps seven -1s and seven 0s. Or maybe seven -1s, followed by six 0s, then five 1s, and so on, but after a certain point it would seem we have to have negative copies of a number, which is meaningless.

Or maybe it's not periodic, and every seventh value in the sequence is incremented by 1? Who knows?

I'll go ahead and assume the latter case, that the sequence is not periodic, since that's technically somewhat easier to manage. We can assign the following rule to the n-th term in the sequence:

\{a_n\}=\{-1,\ldots,-1,0,\ldots,0,1,\ldots,1,2,\ldots,2,3,\ldots\}
\implies a_n=\left\lfloor\dfrac n7\right\rfloor-1

for n\ge0.

So the generating function for this sequence might be

G(a_n;x)=\displaystyle\sum_{n\ge0}\left(\left\lfloor\frac n7\right\rfloor-1\right)x^n

As to what is meant by "closed form", I'm not sure. Would this answer be acceptable? Or do you need to find a possibly more tractable form for the coefficient not in terms of the floor function?
4 0
3 years ago
Tierra bought 4 3/8 yards blue ribbon and 2 1/8 yards yellow ribbon for a craft project. How much more blue ribbon than than yel
PolarNik [594]
She bought 2 1/4 more blue ribbon.

4 3/8 - 2 1/8 = 2.25
2.25= 9/4
9/4= 2 1/4

-Katie ;)
4 0
3 years ago
Read 2 more answers
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