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finlep [7]
3 years ago
6

the mean height of 20 boys and 14 girls is 161 cm. if the mean height of the 14 girls is 151 cm. find the mean height of 20 boys

​
Mathematics
1 answer:
Alika [10]3 years ago
5 0

Answer:

Answer:171 cm

Step-by-step explanation:

161 = x +151/2

161*2 = x + 151

322 - 151 = 171

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What are the measures of Angles a, b, and c? Show your work and explain your answers.
Lyrx [107]

Answer:

  (a, b, c) = (30°, 60°, 105°)

Step-by-step explanation:

Angle "a" and 30° are vertical angles, hence equal.

Angle "b" and angle "a" are complementary angles, so b = 90° -30° = 60°.

Angle "c" is supplementary to the one marked 75°, so is 180° -75° = 105°.

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Angles "a" and "b" are complementary because the sum of angles in a triangle is 180° and the third angle in that triangle is 90°. Then ...

  a+b = 180°-90° = 90°

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75° and "c" are supplementary, because they are linear angles. The angle measure of a line is 180°, so that is their total measure.

6 0
3 years ago
Find the area of the figure.
mel-nik [20]

Answer:

192+128+112+36=468 not really sure if this is the answer

4 0
3 years ago
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Which of the following is not a Pythagorean triple?. . A.. 28, 45, 53. B.. 16, 63, 65. C.. 13, 84, 85. D.. 11, 61, 62.
Anna11 [10]
A set of numbers is said to be Pythagorean triple if the sum of the squares of the lesser numbers equal the square of the remaining number,

A. 28² + 45² = 2809    ;  53² = 2809     ; EQUAL
B. 16² + 63² = 4225    ;  65²= 4225      ; EQUAL
C. 13² + 84² = 7225    ;  85² = 7225     ; EQUAL
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The answer is letter D.
6 0
3 years ago
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A tree's height increase by 15%. If a tree is 23 feet high, how tall will it be in one year ?
Ghella [55]

Increased height:-

\\ \sf\longmapsto 23\times 15\%

\\ \sf\longmapsto 23\times \dfrac{15}{100}

\\ \sf\longmapsto \dfrac{345}{100}

\\ \sf\longmapsto 3.45

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8 0
3 years ago
Please help ill give brainliest answer!
LenKa [72]

Answer:

OC=48

RK=100

Step-by-step explanation:

We can use proportions to find both OC and RK.

\frac{OK}{KY} =\frac{OC}{RY}

\frac{12}{24} =\frac{OC}{96}

24OC=1152

OC=48

\frac{KC}{RK} =\frac{OK}{KY}

\frac{50}{RK} =\frac{12}{24}

12RK=1200

RK=100

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3 years ago
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