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3 years ago

Hey can anyone pls help me out in dis math problem real quick I WILL MARK U AS BRAINLIEST!!!!!!!!

Mathematics

2 answers:

lbvjy [14]3 years ago

6 0

Answer:

1.) 4.87831517751

2.) 12.124355653

Step-by-step explanation:

A.)

The diagonal is 4.87831517751 FT long.

The diagonal equals the square root of the width squared plus the height squared.

Square root of 2 is 1.41421356237

Square root of 12 is 3.46410161514

3.46410161514 + 1.41421356237 = 4.87831517751 .

B.)

The diagonal is 12.124355653 CM long.

The main diagonal of any cube can be found by multiplying the length of one side by the square root of 3.

Square root of 3 is 1.73205080757

1.73205080757 x 7 = 12.124355653

Alenkinab [10]3 years ago

5 0

Answer:

14.4 my guy

Step-by-step explanation:

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In a multiple choice quiz there are 5 questions and 4 choices for each question (a, b, c, d). Robin has not studied for the quiz

Ahat [919]

Answer:

a) There is a 18.75% probability that the first question that she gets right is the second question.

b) There is a 65.92% probability that she gets exactly 1 or exactly 2 questions right.

c) There is a 10.35% probability that she gets the majority of the questions right.

Step-by-step explanation:

Each question can have two outcomes. Either it is right, or it is wrong. So, for b) and c), we use the binomial probability distribution to solve this problem.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$

In which $C_{n,x}$ is the number of different combinatios of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And $\pi$ is the probability of X happening.

In this problem we have that:

Each question has 4 choices. So for each question, Robin has a $\frac{1}{4} = 0.25$ probability of getting ir right. So $\pi = 0.25$ . There are five questions, so $n = 5$ .

(a) What is the probability that the first question she gets right is the second question?

There is a 75% probability of getting the first question wrong and there is a 25% probability of getting the second question right. These probabilities are independent.

$P = 0.75(0.25) = 0.1875$

There is a 18.75% probability that the first question that she gets right is the second question.

(b) What is the probability that she gets exactly 1 or exactly 2 questions right?

This is: $P = P(X = 1) + P(X = 2)$

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$

$P(X = 1) = C_{5,1}.(0.25)^{1}.(0.75)^{4} = 0.3955$

$P(X = 2) = C_{5,2}.(0.25)^{2}.(0.75)^{3} = 0.2637$

$P = P(X = 1) + P(X = 2) = 0.3955 + 0.2637 = 0.6592$

There is a 65.92% probability that she gets exactly 1 or exactly 2 questions right.

(c) What is the probability that she gets the majority of the questions right?

That is the probability that she gets 3, 4 or 5 questions right.

$P = P(X = 3) + P(X = 4) + P(X = 5)$

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$

$P(X = 3) = C_{5,3}.(0.25)^{3}.(0.75)^{2} = 0.0879$

$P(X = 4) = C_{5,4}.(0.25)^{4}.(0.75)^{1} = 0.0146$

$P(X = 5) = C_{5,5}.(0.25)^{5}.(0.75)^{0} = 0.001$

$P = P(X = 3) + P(X = 4) + P(X = 5) = 0.0879 + 0.0146 + 0.001 = 0.1035$

There is a 10.35% probability that she gets the majority of the questions right.

6 0

3 years ago

Help me with my problems (sorry if the text is small)

Amiraneli [1.4K]

#1 is x3
Bc x goes up 3 each time and y goes up 2 each time

4 0

3 years ago

Explain the steps you would take to find the area of the following composite shape. (Use 3.14 for TT.)

Advocard [28]

Answer:

pi r squared divided by 2 for the half circle then add the area of the box to you number and there is your area

3 0

2 years ago

The price of a gym membership has a one-time sign-up fee and a monthly fee. The price can be modeled by the function y = 10x + 1

monitta

15; it represents the one-time sign-up fee

The y-intercept can be found either on the graph where the line intercepts the y-axis, or b in the equation y=mx+b.

It represents the fee because it will be charged even if the number of months (x) is zero. 10 is the monthly fee because it is multiplied by x, the number of months.

8 0

3 years ago

Read 2 more answers

If nobody answers me imma just die Cause I know I’m nothing cause nobody will help

inna [77]

Answer:

when reflected across the y-axis the points will reflect onto the other side on the y-axis.

when reflected over the x-axis the points with reflect onto the x-axis

3 0

3 years ago