I'm confused. Can someone help please? (Pictures below)

Mathematics

1 answer:

liberstina [14]3 years ago

6 0

The simplified answer is f= 39/77

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I will give 30 points please don’t mess around. Write an informal proof for why the construction of an equilateral triangle work

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Answer:

An equilateral triangle is one with all three sides the same length. It begins with a given line segment which is the length of each side of the desired equilateral triangle. ... It is similar to the 60 degree angle construction, because the interior angles of an equilateral triangle are all 60 degrees.

Step-by-step explanation:

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A pet store has 9 dogs, 6 cats, 8 gerbils, and 7 parrots. A pet is chosen at random. What is the probability of choosing a cat o

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Answer: D I believe since 15 is 50% of 30

Step-by-step explanation: Sorry if I'm wrong, If I'm right can you mark brainliest :)

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Explain the relationship between multiplying and dividing by 10, 100, and 1000 and moving the decimal point to the right and to

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Examples:
1) Multiplying (for 10 , 100, 1000 always moving to the right)
 12.45*10=124.5*10 Moving to the right (1 "step")
 37.321*100=3732.1 Moving to the right (2 "steps")
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2) Dividing (for 10 , 100, 1000 always moving to the left)
 56.89/10= 5.689 Moving to the left (1 "step")
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3 years ago

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

alexandr402 [8]

Answer:

$\frac{d\,arccos(x)}{dx} =-\frac{1}{\sqrt{1-x^2} }$

See the proof below

Step-by-step explanation:

if $y=arccos(x)$ , then : $cos(y)=cos(arccos(x))=x$

We can then apply the derivative to both sides of this last equation and remember to use the chain rule as we encounter the variable "y":

$cos(y)=x\\\frac{d}{dx} cos(y)=\frac{d}{dx} x\\-sin(y)\,\frac{dy}{dx} =1\\\frac{dy}{dx} =-\frac{1}{sin(y)} \\\frac{dy}{dx} =-\frac{1}{\sqrt{1-cos^2(y)} }\\\frac{dy}{dx} =-\frac{1}{\sqrt{1-x^2} }\\\frac{d\,arccos(x)}{dx} =-\frac{1}{\sqrt{1-x^2} }$

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3 years ago

Can u guys help me on number 9 ,plz :)

Dima020 [189]

For number nine you have to find the area for the three figures. so multiply 5x3=15. then multiply 6x5=30. lastly multiply 5x2=10. add all those numbers up and get 65

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