Pls help due soon I’ll be giving brainliest :))

Mathematics

2 answers:

Arada [10]2 years ago

8 0

Answer:

im pretty sure first question is 28.6 seconds

and second one is 276 total pounds

Step-by-step explanation:

The first one is 86 divided by 3 = 28.6 seconds

the second one is 23 x 12 = 276 pounds

Sergeeva-Olga [200]2 years ago

8 0

Answer:

7) 86 - 3x 8) 23 + 12w

Step-by-step explanation:

For question 7, the elevator's initial 'value' is 86 and the rate of change is 3 feet per second (x). The key word is 'descending'. Because of this the expression will subtract 3x instead of adding it. 86 - 3x

For question 8, the total weight is the crate's initial 23 and the extra (w) pounds for 12 boxes. 23 + 12w

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aleksklad [387]

Answer:

The answer is -1 (B)

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You take a quiz with 6 multiple choice questions. After you studied your estimated that you would have about an 80 % chance of g

Arada [10]

Answer:

1.15%

Step-by-step explanation:

To get the probability of m independent events you multiply the individual probability of each event. In this case we have m independent events, each one with the same probability, therefore:

$p^{m}$

$0.8^{20} = 1.15\%$

This is a particlar scenario of binomial distribution problem. So the binomial distribution questions are about the number of success of m independent events, where every individual event has the same p probability. In the question we have 20 events and each event has a probability of 80%. The binomial distribution formula is:

$\binom{n}{k} * p^{k} * (1-p)^{n-k}$

n is the number of events

k is the number of success

p is the probability of each individual event

$\binom{n}{k}$ is the binomial coefficient

the binomial coefficient allows to find the subsets of k elements in a set of n elements. In this case there is only one subset possible since the only way to get 20 of 20 correct questions is to getting right all questions (for getting 19 of 20 questions there are many ways, for example getting the first question wrong and all the other questions right, or getting second questions wrong and all the other questions right, etc).

$\binom{n}{k} = \frac{n!}{k!(n-k)!}$