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leva [86]
4 years ago
9

A 40-foot ladder is leaning against a wall. To use the ladder safely, the angle between the wall and the ladder must be no more

than 15 degrees. A worker places the bottom of the ladder 12 feet from the wall, and begins to climb. is the worker safe?​
Mathematics
1 answer:
svetoff [14.1K]4 years ago
6 0

Answer:

No,because the angle between the wall and the ladder is 17.45°

Step-by-step explanation:

Let's first outline the parameters in this particular question

--- the angle between the wall and ladder is 15°

--- the ladder is 40 foot tall

---the bottom of the ladder is placed 12 feet from the wall.

With the above,we can conclude that the ladder placed against the wall formed a shape that has the look of a right angle triangle, where the length if the ladder is the hypotenuse, the distance between the foot of the ladder and the wal is the adjacent, and the height of ladder against the wall is unknown.

Let's now try to find the value of the unknown (in this case,the opposite of that triangle shape formed)

Using Pythagorean theorem, where c = √(a² + b²)

(C is the hypotenuse, a and b are the adjacent and opposite respectively)

40² = 12² + x²

X² = 40² - 12²

X² = 1456

X = √1456

X = 38.2

Now to find the angle made by the wall and the ladder

Tan x = opp/adj

Tan x = 12/38.2

Tan x = 0.3141

X = tan inverse of 0.3141

X = 17.45°(the angle between the wall and the ladder)

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timurjin [86]

Answer:

Proved

Step-by-step explanation:

cos^4\alpha +sin^4\alpha =\frac{1}{4}(3+cos4\alpha )\\\\

Take the Left Hand Side:

cos^4\alpha +sin^4\alpha\\\\(cos^2\alpha )^2+(sin^2\alpha )^2\\\\(\frac{1+cos2\alpha }{2})^2+(\frac{1-cos2\alpha }{2})^2  \\\\\frac{1+2cos2\alpha +cos^22\alpha }{4}+\frac{1-2cos2\alpha +cos^22\alpha }{4} \\\\

\frac{1+2cos2\alpha +cos^22\alpha +1-2cos2\alpha +cos^22\alpha }{4} \\\\\frac{2+2cos^22\alpha }{4} \\\\\frac{1+cos^22\alpha }{2} \\\\\frac{1}{2}(1+cos^22\alpha )\\\\

\frac{1}{2}(1+\frac{1+cos4\alpha }{2})

\frac{1}{2}(\frac{2+1+cos4\alpha }{2})\\\\\frac{1}{4}(3+cos4\alpha )\\\\

Hence Proved!

The following identities were used are attached in an image

3 0
3 years ago
35/40 reducing fractions
laila [671]

Answer: 7/8

What you have to do here is to find the highest number which can be divided by both. Or you have to divide both the numerator and denominator until it can not be divided by any number anymore. You can do this by finding the highest common factor (<u>HCF)</u> of both the number, 35 and 40.

Highest Common Factor: HCF of two or more numbers is the greatest factor that divides the numbers. For example, 2 is the HCF of 4 and 6.

So, the highest number which divides 35 and 40, is 5. Now 35 divided by 5 is 7 and 40 divided by 5 is 8. The final answer is 7/8 and there is no more numbers which can divide both of them by a specific number.


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(„• ֊ •„)♡
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   hope it helped
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6 0
2 years ago
Max have a 7.5% chance out of 20 to have a girlfriend find 7.5% of 20
Harman [31]
7.5% of 20......turn ur percent to a decimal by dividing it by 100...
7.5 / 100 = 0.075..." of " means multiply....0.075(20) = 1.5 <=
5 0
4 years ago
Read 2 more answers
Write an expression to represent:Nine less than the quotient of two and a number xxx.
Illusion [34]

Answer:

2/x - 9

Step-by-step explanation:

Hi there!

"9 less than" means we'll be subtracting 9 from our expression

"the quotient of 2 and a number x" means we'll be dividing 2 and x:

2/x - 9

I hope this helps!

3 0
3 years ago
Can someone help me with this?
Roman55 [17]

Answer:

Step-by-step explanation:

We first need to figure out how much money Jackie has since Pilar has the same amount of money, but in different coins. Jackie has 24 dimes and 13 quarters, so the amount of money is $2.40 + $3.25 = $5.65; therefore, Pilar has $5.65 also. In order to determine how many nickels and quarters Pilar has, we have to have a system of equations. It's up to us to write the equations we need to solve this. The first equation has to do with the NUMBER of coins Pilar has, the second has to do with the VALUE of each coin. We know that Pilar has only nickels and quarters and that she has a total of 53 coins. So the NUMBER equation is

n + q = 53

The VALUE equation relates how much each coin is worth to the total amount of money it equals:

.05n + .25q = 5.65.

Go back to the first equation and solve it for either n or q. I solved it for n:

n = 53 - q

Plug this into the second equation in place of n now to get:

.05(53 - q) + .25q = 5.65 and

2.65- .05q + .25q = 5.65 and

.20q = 3 so

q = 15. This means that there are 15 quarters. If there are 15 quarters, then there are

n + 15 = 53 nickels and

n = 38 nickels.

7 0
3 years ago
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