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Elodia [21]
3 years ago
13

A student takes an exam containing 18 true or false questions. If the student guesses, what is the probability that he will get

exactly 6 questions right? Round your answer to four decimal places.

Mathematics
1 answer:
V125BC [204]3 years ago
3 0
Use this formula.
and solution is:[(18!)/(6!×(18-6)!)]×(1/2)^6×(1-1/2)^(18-6)≈0.0781604
7.8%

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8x^3-22x^2-4 divided by 4x-3
MA_775_DIABLO [31]
The answer is 24 because 8 times 3 is 24
3 0
3 years ago
What is 3.96 × 0.4, please help me ​
Kisachek [45]

Answer:

1.584

Step-by-step explanation:

1.584 = 3.96 × 0.4

8 0
3 years ago
Read 2 more answers
A boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h.
docker41 [41]

Answer:

A)63miles per hour.

B)27 miles per hour

Step-by-step explanation:

HERE IS THE COMPLETE QUESTION

boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h. What is the boat's speed (in still water)??b) How fast does the current in the river flow?

Let the speed of boat in still water = V(boat)

speed of current=V(current)

To calculate speed of boat downstream, we add speed of boat in still water and speed of current. This can be expressed as

[V(boat) +V(current)]

It was stated that it takes 1hour for the

boat to travels between two points of 90 mi apart downstream.

To calculate speed of boat against current, we will substact speed of current from speed of boat in still water. This can be expressed as

[V(boat) - V(current)]

and it was stated that it takes 2 1/2 for return trip against the Current

But we know but Speed= distance/time

Then if we input the stated values we have

V(boat) + V(current)]= 90/1 ---------eqn(1)

V(boat) - V(current) = 90/2.5----------eqn(2)

Adding the equations we have

V(boat) + V(current) + [V(boat) - V(current)]= 90/2.5 + 90/1

V(boat) + V(current) + V(boat) - V(current)]=90+36

2V(boat)= 126

V(boat)=63miles per hour.

Hence, Therefore, the speed of boat in still water is 63 miles per hour.

?b) How fast does the current in the river flow?

the speed of the current in the river, we can be calculated if we input V(boat)=63miles per hour. Into eqn(1)

V(boat) + V(current)]= 90/1

63+V(current)=90

V(current)= 27 miles per hour

Hence,Therefore, the speed of current is 27 miles per hour.

7 0
3 years ago
Yx*2; use x=7,And y=2
Lyrx [107]

Answer:

28

Step-by-step explanation:

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Then you just have to times them all together and you get 2*7=14 then 14*2=28

6 0
3 years ago
Determine which ordered pair makes the equation true.<br> 2x + y = 11
slavikrds [6]
There is no one ordered pair that makes the equation true, this is a line which has infinitely many ordered pairs that are true...

2x+y=11  subtract 2x from both sides and you have the line in slope intercept form..

y=11-2x

For any real given value of x, you will get one real unique corresponding value for y, resulting in infinitely many unique (x,y) values, points, or ordered pairs, satisfying the given equation.

I assume that you were given "choices" to pick from because of the above reality.  So if any of your choices does not satisfy y=11-2x it is not an ordered pair satisfying the equation.
4 0
3 years ago
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