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ki77a [65]
3 years ago
5

What is the measurement of BC?

Mathematics
2 answers:
irinina [24]3 years ago
6 0

Answer:

                      BC=4.42        

Step-by-step explanation:

Given:

         ∠B=70°

       AB=13

cos(B°)=  \frac{Base}{Hypotenuse}

cos(70°)= \frac{BC}{13}

Given:     cos(70°)≈0.34

                        0.34=\frac{BC}{13} \\\\BC=0.34*13\\\\BC=4.42

The measurement of BC is

                    BC=4.42

galina1969 [7]3 years ago
5 0

Answer:

180 - 90 - 70 = 20

13/sin90 = BC / sin20

BC = 4.45

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We are given that the tensile strength of stainless steel produced by a plant has been stable for a long time with a mean of 72 kg/mm 2 and a standard deviation of 2.15.

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P(-1.96 < \frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } } < 1.96) = 0.95

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P( \bar X-1.96 \times {\frac{\sigma}{\sqrt{n} } } < \mu < \bar X+1.96 \times {\frac{\sigma}{\sqrt{n} } } ) = 0.95

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