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ad-work [718]
3 years ago
14

there are 6 row of 16 chair set up for the third grade play. in the first 4 row, 2 chair on each end are reserved for teacher. t

he rest of chair are for student. how many chair are there for student
Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
8 0
16×6=96, 4×2=8, 96-8=88
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A bridge 48m tall.a scale model of the bridge 37cm long and 12cm tall .how long is the actual bridge .
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Please help find them <br>1 AB<br><br>2 BC​
spin [16.1K]

Answer:

AB ≈ 15.7 cm, BC ≈ 18.7 cm

Step-by-step explanation:

(1)

Using the Cosine rule in Δ ABD

AB² = 12.4² + 16.5² - (2 × 12.4 × 16.5 × cos64° )

       = 153.76 + 272.25 - (409.2 cos64° )

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AB = \sqrt{246.63} ≈ 15.7 cm ( to 1 dec. place )

(2)

Calculate ∠ BCD in Δ BCD

∠ BCD = 180° - (53 +  95)° ← angle sum in triangle

∠ BCD = 180° - 148° = 32°

Using the Sine rule in Δ BCD

\frac{BC}{sin53} = \frac{BD}{sin32} = \frac{12.4}{sin32} ( cross- multiply )

BC × sin32° = 12.4 × sin53° ( divide both sides by sin32° )

BC = \frac{12.4sin53}{sin32} ≈ 18.7 cm ( to 1 dec. place )

         

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