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masha68 [24]
3 years ago
13

Can someone pls help me??!?!

Mathematics
2 answers:
GalinKa [24]3 years ago
4 0

Answer:

x=25

Step-by-step explanation:

angles are vertical angles so they are equal

set expressions equal to each other: 5x-10=3x+40

subtract 3x from both sides: 2x-10=40

add 10 to both sides: 2x=50

divide by 2: x=25

lys-0071 [83]3 years ago
3 0

Answer:

x=25

Step-by-step explanation:

(5x-10)=(3x+40) because from what I understand they are vertical angles

5x-3x=40+10

2x=50

x=25

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Prove the formula for (d/dx)(cos−1(x)) by the same method as for (d/dx)(sin−1(x)). Let y = cos−1(x). Then cos(y) = and 0 ≤ y ≤ π
gtnhenbr [62]

Answer:

\frac{d(cos^{-1}x )}{dx} = \frac{-1}{\sqrt{1-x^2} }

Step-by-step explanation:

Given the differential (d/dx)(cos−1(x)), to find the equivalent formula we will differentiate the inverse function using chain rule as shown below;

let;

y = cos^{-1} x \\\\taking \ cos\ of\ both\ sides\\\\cosy = cos(cos^{-1} x)\\\\cosy = x\\\\x = cosy\\\\\frac{dx}{dy} = -siny\\

\frac{dy}{dx} = \frac{-1}{sin y}  \\\\from\ trigonometry\ identity,\ sin^{2} x+cos^{2}x = 1\\sinx = \sqrt{1-cos^{2} x}

Therefore;

\frac{dy}{dx} = \frac{-1}{\sqrt{1-cos^{2}y } }

Since x = cos y from the above substitute;

\frac{dy}{dx} = \frac{-1}{\sqrt{1-x^{2}} }

Hence, \frac{d(cos^{-1}x )}{dx} = \frac{-1}{\sqrt{1-x^2} } gives the required proof

5 0
4 years ago
What type of graph can have two x-intercepts?
makkiz [27]

Answer: A quadratic graph can have two x-intercepts

7 0
3 years ago
Giving brainliest to the CORRECT answer
eimsori [14]

brainliest pls pls pls

Step-by-step explanation:

x is greater than 1

3 0
3 years ago
Round 478.54 to the nearest tenth
Schach [20]
A tenth is the number that occurs after the decimal
If the number after the tenth is five or higher, then you round up
If the number after the tenth if four or lower, then the tenth stays the same value as it is
In this case, the Ume after the tenth is exactly four, so the value of the tenth stays the same
So your answer is 478.5
8 0
3 years ago
Read 2 more answers
Please help, I will mark brainliest if correct.
nadezda [96]

Answer:

100

Step-by-step explanation:

something about them being diagnol to each other makes them equal

havent done geometry in a while lol

hope this helps <3

5 0
3 years ago
Read 2 more answers
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