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Alex777 [14]
3 years ago
14

What are the solutions of the quadratic equation? X2=-5x-3

Mathematics
1 answer:
vagabundo [1.1K]3 years ago
4 0
<span>the correct answer is  x^2</span>+5x+3=<span>0</span>
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Problem 5.A miner is trapped inside a mine and has access to 3 doors. The first door leads to a tunneland can take him to safety
Likurg_2 [28]

Answer:

Expected time is 15 hours for him to get to safety.

Step-by-step explanation:

We define X as the time that this miner would get to safety.

We define Y as the door he chooses initially.

P(Y= 1) = P(Y=2)=P(Y=3) = 1/3

We have E[X|Y=1] = 3

E[X|Y] = 5 hours + E[X}

E[X|Y] = 7 hours + E[X]

Then we have

E[X] = 1/3(3 + 5 + E[X] + 7 + E[X])

We cross multiply

3*E[X] = (15 + 2E[x])

3E[X] - 2E[X] = 15

E[X] = 15

So the time it would take to get him to safety is 15 hours

5 0
2 years ago
Andrew claims the initial value and y - intercept are the same thing on a graph. Is he correct?
Agata [3.3K]

Answer:

We conclude that the initial value and y-intercept are the same thing on a graph.

Please check the attached graph of the equation y = 2x+1.

Step-by-step explanation:

We know that the initial value on a graph is basically the out-put value y of the point where the line meets or crosses the y-axis.

In other words, the initial value is the y-value or output of the point at x = 0

For example,

Let the equation

y = 2x+1

substitute x = 0

y = 2(0)+1

y = 0+1

y = 1

Thus, the initial value of the equation y = 2x+1 is: y = 1

Please check the attached graph of the equation y = 2x+1.

It is clear from the graph that at x = 0, the value of y = 1.

Thus, at y = 1, the line meets the y-axis.

Hence, the initial value of the line is: y = 1

Similarly, we know that the value of the y-intercept can be determined by setting x = 0 and determining the corresponding value of y.

For example,

Let the equation

y = 2x+1

substitute x = 0

y = 2(0)+1

y = 0+1

y = 1

Thus, the y-intercept of y = 2x+1 is y = 1.

Please check the attached graph of the equation y = 2x+1.

It is clear from the graph that at x = 0, the value of y = 1.

Therefore, the y-intercept of y = 2x+1 is y = 1.

Conclusion:

Therefore, we conclude that the initial value and y-intercept are the same thing on a graph.

Please check the attached graph of the equation y = 2x+1.

6 0
2 years ago
Really need help please help me please please
Maru [420]

Answer:

y = 3/4x + 3

Step-by-step explanation:

you should only have y in one side and everything in other side of the equation. so you will first have -4y = -3x -12 , then you'll have to divide the right part of the equation by -4 . then you will have y = 3/4x + 3

3 0
3 years ago
Simplify the following expression.
Sholpan [36]

Answer:

108.35

Step-by-step explanation:

Order of Operations: PEMDAS

PEMDAS  =

Parenthesis

Exponents (& Roots)

Multiplication

Division

Addition

Subtraction.

First, multiply 5.4 with 15.75:

5.4 x 15.75 = 85.05

Next, add:

85.05 + 23.3  = 108.35

108.35 is your answer.

~

6 0
3 years ago
Read 2 more answers
A cylinder has a radius of 50 ft and a height of 18 ft. What is the exact surface area of the cylinder?
Sati [7]
The formula of the total surface area of the cylinder would be: Base area+ surface area along the circumference.

To find an exact value,we would also have to save 兀and not turn it in other approximate values.

The base area would be:
兀r^2
=兀(50)^2
=2500兀 ft^2

The surface area along the circumferecen would be:
2兀r(base circumference) x height
=2兀50×18
=250兀×18
=4500兀 ft^2

Adding them up,we would then find the total surface area:

4500兀+2500兀
=7000丌 ft^2

Thus,the answer is 7000 丌 ft^2.

Hope it helps!
4 0
3 years ago
Read 2 more answers
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