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aliya0001 [1]
3 years ago
14

A ladder rests against a vertical wall at an inclination Alfa to the horizontal. It's foot is pulled away from the wall through

distance p so that its upper end sides a distance q down the wall and then the ladder makes an angle bita to the horizontal,show that p/q=cos Bita-cos alfa/sin Alfa-sin bita
Mathematics
2 answers:
Tresset [83]3 years ago
7 0

I assume you have a drawing of this problem. If not, then draw it this way.

Draw a vertical segment on the left side of the paper. Starting at the lower endpoint, draw a horizontal segment to the right. You now have the wall and the floor. Now draw a slant segment connecting the two segments. This is the ladder. Mark the lower right acute angle alpha. Now using the same length segment, draw a new segment connecting the perpendicular ones a little lower on the wall than the previous one. It will end up on the floor to the right of the previous one. Label the distance between the segments on the wall q and the distance between the endpoints of the slant segments on the floor p. Now label the distance from the lower endpoint on the wall to the floor r, and the distance from the left endpoint on the wall to the wall s. The length of both slant segments is t.

We need to use sines and cosines to find expressions for p and q.

We'll start with sine and q.

\sin \alpha = \dfrac{q + r}{t}

q + r = t \sin \alpha

\sin \beta = \dfrac{r}{t}

r = t \sin \beta

Now we subtract the expression for r from the expression for q + r.

q + r - r = t \sin \alpha - t \sin \beta

q = t (\sin \alpha - \sin \beta)

We have an expression for q in terms of the length of the ladder, t, and the angles alpha and beta.

Now we work on p by using the cosine of the angles.

\cos \alpha = \dfrac{s}{t}

s = t \cos \alpha

\cos \beta = \dfrac{p + s}{t}

p + s = t \cos \beta

Now we subtract the expression for s from the expression for p + s.

p + s - s = t \cos \beta - t \cos \alpha

p = t(\cos \beta - \cos \alpha)

Now we have an expression for p in terms of t and the angles alpha and beta.

To find the ratio of p to q, we divide their expressions.

\dfrac{p}{q} = \dfrac{t(\cos \beta - \cos \alpha)}{t (\sin \alpha - \sin \beta)}

Cancel out t to get:

\dfrac{p}{q} = \dfrac{\cos \beta - \cos \alpha}{\sin \alpha - \sin \beta}

mestny [16]3 years ago
3 0
I would help if I knew but this beyond my level,even though I am really good at math.
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Fed [463]
A=10*8+((8-6)(15-10))/2
A=10*8+(2*5)/2
A=10*8+10/2
A=10*8+5
A=80+5
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Therefore the answer is D

Hope this helps :)
3 0
3 years ago
Find the measure of angle 4 AND...… angle 7
zaharov [31]

Answer:

<4 = 126

<7 = 55

Step-by-step explanation:

Remark

There are only 2 answers to this question. <4 has one of them and <7 has the other one. <7 is acute. <2 is obtuse.

Givens

<2 = 55 degrees

Solution

<4 is the supplement of <2

Therefore <4 + <2 = 180                     A straight line has an angle of 180°

<4 + 55 = 180

<4 = 180 - 55

<4 = 125

So <7 is either 55 or 125. Since <7 is acute, it is 55 degrees but we have another way of proving it.

<4 + <6 = 180 degrees            Interior angles on the same side of the transversal are supplementary

125 + <6 = 180

<6 = 180 - 125

<6 = 55

<7 =<6                                    Vertically opposite angles are equal.

<7 = 55 degrees.

4 0
3 years ago
Will give Brainlest Answer please answer i need help
Rashid [163]

Answer:

  C.  {-1, 5, 8}

Step-by-step explanation:

Use each of the domain values in the function to see what the corresponding range value is.

  f(-1) = 5 -3(-1) = 8

  f(0) = 5 -3(0) = 5

  f(2) = 5 -3(2) = -1

The range is the set of numbers {-1, 5, 8}.

_____

<em>Additional comment</em>

The values in a set are generally listed lowest to highest. The coefficient of x in the equation for f(x) is negative, meaning the lowest range value will correspond to the highest domain value. If you start by finding f(2) = -1, you immediately eliminate all answer choices except B and C.

Those choices differ only in the middle value, so you can tell which is correct by evaluating f(x) for the middle domain value: f(0) = 5. Only one answer choice has both -1 and 5 in the set.

(There are two answers here: how you work the problem, and how you game a multiple choice question.)

4 0
2 years ago
: If 10 less than 5 times a number is two more than 3 times the number, then the number is ​
Feliz [49]

Answer:

<h2><u><em>x = 1</em></u></h2>

Step-by-step explanation:

If 10 less than 5 times a number is two more than 3 times the number, then the number is ​

10 - 5x = 2 + 3x

10 - 2 - 5x - 3x = 0

8 - 8x = 0

x = 1

---------------

check

10 - 5 * 1 = 2 + 3 * 1

5 = 5

the answer is good

6 0
2 years ago
PLEASE HELP AND EXPLAIN ALSO SHOW WORK​
Goryan [66]

Answer:

x=10

Step-by-step explanation:

Make 2x the only variable on the left side of the equation. Do that by taking 3 and 5 to the left. Note: if you move/transpose any number the sign must change.

2x = 18+5-3

2x=20

Divide both sides of the equation by 2 to make x the only variable left.

x=10

6 0
2 years ago
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