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marta [7]
2 years ago
5

PLEASE HELP ME PRESS THE PHOTO ABOVE

Mathematics
2 answers:
hjlf2 years ago
6 0
Multiply then add and then subtract
Mice21 [21]2 years ago
6 0

Answer:

x=5

Step-by-step explanation:

2x+4-6x=-16

-4x+4= -16

-4x+4-4=-16-4

-4x=-20

-4x/-4 = -20/-4

x=5

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If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct.
ad-work [718]

Answer:

Probability = 0.190

Step-by-step explanation:

Given:

Number of questions, 'n' = 20

Each question has four choices.

Let event of choosing correct answer be success and its probability be represented by 'p'.

Therefore, event of choosing wrong answer is failure and its probability be represented by 'q'.

Now, probability of success is choosing one correct answer out of 4 options. So, p=\frac{1}{4}=0.25

Now, 'p' and 'q' are complements of each other. Therefore,

q=1-p=1-0.25=0.75

Now, we need 4 successes. Therefore, x=4

Using Bernoulli's theorem to find 'x' successes from 'n' questions, we get:

P(x)=_{x}^{n}\textrm{C}p^xq^{n-x}

Plug in 4 for 'x', 20 for 'n', 0.25 for 'p' and 0.75 for 'q'. Solve.

P(4)=_{4}^{20}\textrm{C}(0.25)^4(0.75)^{20-4}\\P(4)=_{4}^{20}\textrm{C}(0.25)^4(0.75)^{16}\\P(4)=4845\times (0.25)^4\times (0.65)^{16}\\\\P(4)=0.1896\approx0.190

Therefore, the probability of getting 4 correct answers out of 20 questions is 0.190.

6 0
3 years ago
Perimeter 254 meters and dimension measures 6 meters​
Mamont248 [21]

Answer:

didn't even ask a question

Step-by-step explanation:

impossible to answer without a question

5 0
2 years ago
a rectangular sandbox has a width of 15 ft and a length of X feet which expression represents the perimeter of the sandbox ​
Phantasy [73]

Answer:

15(2) + x(2)= perimeter

Step-by-step explanation:

5 0
3 years ago
1.)300.8 m to yards<br> 2.)80 yards to mm<br> 3.)15 kg/L<br> 4.)40cm/sec to mph
Lapatulllka [165]

1.)3.&

2.)8mm

3.)5

4.)400

5 0
3 years ago
A hot air ballon begins its descent at a rate of 22 1/2 feet per minute. How long will it take for the balloon's elevation
Semmy [17]
The descent of the balloon would take 14 minutes
To find the answer to this problem, take the elevation change (315) and then divide it by the rate of descent (22.5)
5 0
3 years ago
Read 2 more answers
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