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Brilliant_brown [7]
3 years ago
12

Help please !!!!!!!!!!!!!!

Mathematics
1 answer:
yKpoI14uk [10]3 years ago
5 0
1) The triangles are similar, so correponding sides have the same ratio.
.. 3x/20 = (4x +2)/28
.. 3x/5 = (4x +2)/7 . . . . . . . multiply by 4
.. 7*3x = 5(4x +2) . . . . . . . multiply by 35 = 5*7
.. 21x = 20x +10 . . . . . . . . eliminate parentheses
.. x = 10 . . . . . . . . . . . . . . . subtract 20x


2) The triangles are similar, so corresponding measures have the same ratio.
.. x/42 = 10/15
.. x = 42*(10/15) = 28


3) The third angle of triangle ABC is 180° -20° -80° = 80°. Then two of the angles of ABC match those of JKL. The 3rd answer selection is appropriate.
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Joseph leans a 20-foot ladder against a wall so that it forms an angle of 69° with the
barxatty [35]

Answer:

18.67 ft

Step-by-step explanation:

     |\

     |   \

     |      \

h    |         \     20 ft

     |            \

     |               \

     |--        69°  \

     ---|----------------

For the 69° angle, h is the opposite leg, and 20 ft is the hypotenuse.

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sin 69° = h/20

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Answer: 18.67 ft

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3 years ago
The loudness, L, measured in decibels (Db), of a sound intensity, I, measured in watts per square meter, is defined as
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\\ \rm\dashrightarrow B=10log\dfrac{I}{I_o}

\\ \rm\dashrightarrow B=10\log\dfrac{10^{-7}}{10^{-12}}

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\\ \rm\dashrightarrow B=10(5)

\\ \rm\dashrightarrow B=50dB

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With random sample of 50 and probability of adult American agrees is 75%, then the sampling distribution of the sample proportion is the Binomial distribution, with n=50 and p=0.75

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