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3 years ago

PLEASE ANSWER I NEED DONE

Mathematics

2 answers:

dezoksy [38]3 years ago

5 0

Answer:

The other answer is wrong. It is r^2/R^2.

Step-by-step explanation:

Troyanec [42]3 years ago

3 0

The picture in the attached figure

we know that
area of a sector=(∅/2)*r²--------> when ∅ is in radians

area of sector inner circle=(∅/2)*r²

area of sector outer circle=(∅/2)*R²-(∅/2)*r²

The ratio of the area of the sector removed from the outer circle to the area of the sector removed from the inner circle is
[(∅/2)*R²-(∅/2)*r²]/[(∅/2)*r²]-----> [R²-r²]/[r²]

therefore

the answer is
(R^2 - r^2)/r^2

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2. Evaluate the expression for a = –1 and b = 5. Show your work. 5a – 7b + b2

Katen [24]

Greetings!

Input the values which represent the variables:
$=5a-7b+b^2$

$=5(-1)-7(5)+(5)^2$

Solve following the Order of Operations:
$=5(-1)-7(5)+25$

$=-5-7(5)+25$

The Answer Is:
$\boxed{-15}$

I hope this helped!
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6 0

3 years ago

What is the value of x? A. 25° B. 50° C. 55° D. 75° E. 80°

Troyanec [42]

Answer:

<h2>Option B</h2><h2>x = 50° </h2>

Step-by-step explanation:

By the condition, 

25° + 105° + x = 180° [Angle sum property of triangle]

=> 130 + x = 180

=> x = 180 - 130

=> x = 50° (Ans)

6 0

3 years ago

Read 2 more answers

7xy - x2t + 4xy + 5xt

Elenna [48]

Answer:

x[ 11y + t(5 - x)].

Step-by-step explanation:

7xy - x^2t + 4xy + 5xt

= 7xy + 4xy + 5xt - x^2t

= 11xy + 5xt - x^2 t

= x(11y + 5t - xt)

= x[ 11y + t(5 - x)].

5 0

3 years ago

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Find P(B|C). P(B|C) = StartFraction 9 Over 34 EndFraction = 0. 26 P(B|C) = StartFraction 9 Over 24 EndFraction = 0. 38 P(B|C) =

Kruka [31]

The question is an illustration of probability, and the value of P(B|C) is P(B|C) = 9/24 =0.38

<h3>How to determine the probability P(B|C)?</h3>

The table is given as:

C D Total

A 15 21 36

B 9 25 34

Total 24 46 70

The probability (BIC) is calculated using:

P(B|C) = n(B and C)/n(C)

From the table, we have:

n(B and C) = 9

n(C) = 24

So, the equation becomes

P(B|C) = 9/24

Evaluate

P(B|C) = 0.38

Hence, the value of P(B|C) is P(B|C) = 9/24 =0.38