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____ [38]
3 years ago
7

Two teams A and B play a series of games until one team wins four games. We assume that the games are played independently and t

hat the probability that A wins any game is p. What is the probability that the series lasts exactly five games?
Mathematics
1 answer:
crimeas [40]3 years ago
6 0

Answer:

4pq(p³+q³)

Step-by-step explanation:

Exactly 5 game would be when 4 wins and 1 loss of a particular person

loss has to be one of the first 4 games

A wins: qp⁴ + pqp³ + p²qp² + p³qp

= qp⁴ + qp⁴ + qp⁴ + qp⁴ = 4qp⁴

B wins: pq⁴ + qpq³ + q²pq² + q³pq

= pq⁴ + pq⁴ + pq⁴ + pq⁴ = 4pq⁴

A wins or B wins:

4pq⁴ + 4qp⁴ = 4pq(q³+p³)

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1.Find the perimeter of the picture frame.
labwork [276]

Perimeter of the frame is 60 in and perimeter of the picture is 52 in. Area of the picture is 160 in²

Step-by-step explanation:

  • Step 1: Find the perimeter of the frame when width = 12 in and length = 18 in

Perimeter of the frame = 2 (length + width)

                                      = 2(18 + 12) = 2 × 30 = 60 in

  • Step 2: Find the perimeter of the picture inside the frame.

Length of the picture = 18 - 2 = 16 in

Width of the picture = 12 - 2 = 10 in

⇒ Perimeter of the picture = 2 (length + width)

                                            = 2 ( 16 + 10) = 2 × 26 = 52 in

  • Step 3: Find the area of the picture.

Area = length × width

        = 16 × 10 = 160 in²

5 0
3 years ago
Consider the equation below. (If an answer does not exist, enter DNE.) f(x) = 7 cos2(x) − 14 sin(x), 0 ≤ x ≤ 2π (a) Find the int
Troyanec [42]

Answer:

[\frac{\pi}{2},\frac{3\pi}{2}]

Step-by-step explanation:

Let me first state that I am assuming your function is

f(x)=7cos^2(x)-14sin(x)

If this is incorrect, then disregard this whole answer/explanation.

In order to find where the function is increasing or decreasing, we need to first find the first derivative, set it equal to 0, and then factor to find the values that cause the derivative to equal 0.  This is where you expect to find a max or a min value in the function itself.  But this function is not going to be easily solved for 0 once we find the derivative unless we make it in terms of either sin or cos right now, before taking the first derivative.  

Let cos^2(x)=1-sin^2(x)

This is a Pythagorean trig identity, and I'm assuming that if you're in calculus solving for the intervals of increasing and decreasing values that you have, at one time, used trig identities.

Rewriting:

f(x)=7(1-sin^2(x))-14sin(x) which simplifies to

f(x)=7-7sin^2(x)-14sin(x) and in order of descending values of x:

f(x)=-7sin^2(x)-14sin(x)+7

Now we can find the derivative.  For the first term, let u = sin(x), therefore,

f(u)=u^2, u' = cos(x), and f'(u) = 2u.  The derivative is found by multiplying f'(u) by u', which comes out to 2sin(x)cos(x)

The derivative for the next 2 terms are simple, so the derivative of the function is

f'(x)=-7[2sin(x)cos(x)]-14cos(x) which simplifies down to

f'(x)=-14sin(x)cos(x)-14cos(x)

We will set that equal to zero and solve for the values that cause that derivative to equal 0.  But first we can simplify it a bit.  You can factor out a -14cos(x):

f'(x)=-14cos(x)(sin(x)+1)

By the Zero Product Property, either

-14cos(x) = 0 or sin(x) + 1 = 0

Solving the first one for cos(x):

cos(x) = 0

Solving the second one for sin(x):

sin(x) = -1

We now look to the unit circle to see where, exactly the cos(x) = 0.  Those values are

\frac{\pi}{2},\frac{3\pi}{2}

The value where the sin is -1 is found at

\frac{3\pi}{2}

We set up a table (at least that's what I advise my students to do!), separating the intervals in ascending order, starting at 0 and ending at 2pi.

Those intervals are

0 < x < \frac{\pi}{2}, \frac{\pi}{2}, and \frac{3\pi}{2}

Now pick a value that falls within each interval and evaluate the derivative at that value and determine the sign (+ or -) that results.  You don't care what the value is, only the sign that it carries.  For the first interval I chose

f'(\frac{\pi}{4})=- so the function is decreasing here (not what you wanted, so let's move on to the next interval).

For the next interval I chose:

f'(\pi)=+ so the function is increasing here.

For the last interval I chose:

f'(\frac{7\pi}{4})=-

It appears that the only place this function is increasing is on the interval

[\frac{\pi}{2},\frac{3\pi}{2}]

3 0
2 years ago
I need help with number 4
gtnhenbr [62]

Answer:

2e3rfe43rdefde

Step-by-step explanation:

6 0
3 years ago
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A line crosses the coordinates (-3,5) and (4,-2). What is the slope of the line?
ICE Princess25 [194]

Answer:

Slope = -1

Step-by-step explanation:

\frac{-2-5}{4-(-3)}=\frac{-7}{7} =-1

8 0
3 years ago
Please show me how to solve the problem
AlladinOne [14]

Answer:

(3x+1)

Step-by-step explanation:

So i start by the little 2 and then the 3 and then 19x +6

4 0
2 years ago
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