3 years ago

What is the value of the expression

Mathematics

1 answer:

hoa [83]3 years ago

4 0

4(2+y)2y-z when x=2 and y=4

4(2+4)2×4-z

4(6)(8-z)

(4×6)(-8z)

24-8z

z=24÷8

8/3

Therefore 8/3 is last answer .

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Find the length of side BC. Give your answer to 3 significant figures. C A 71° B

Vikki [24]

Answer:

BC ≈ 19.4 cm

Step-by-step explanation:

using the cosine ratio in the right triangle

cos71° = $\frac{adjacent}{hypotenuse}$ = $\frac{AB}{BC}$ = $\frac{6.3}{BC}$ ( multiply both sides by BC )

BC × cos71° = 6.3 ( divide both sides by cos71° )

BC = $\frac{6.3}{cos71}$ ≈ 19.4 cm ( to 3 sig. figs )

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Step-by-step explanation:

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