NO MULTIPLE CHOICE Find the length of AB label sides find angles HELP ME PLEASE

Mathematics

2 answers:

Ugo [173]2 years ago

7 0

Answer:

8.4 (rounded to 1 dp)

Step-by-step explanation:

1) Identify the number of angles and sides given if you cannot use Pythagoras or SohCahToa.

2) You have 2 angles and 1 side, so you know you must use sine rule: a over sinA = b over sinB

a = side length, sin(A) = angle opposite side

b = side length, sin(B) = angle opposite side

3) This means:

13/sin(90) = x/sin(40)

4) rearrange for x:

x = 13/sin(90) * sin(40)

= 8.356...

5) Round to however many sig figs/dps they're asking for

Example: 1 dp

AB = 8.4

3 sig figs

AB = 8.36

valkas [14]2 years ago

3 0

Answer:

Step-by-step explanation:

8.4 (rounded to 1pd)...........

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kotykmax [81]

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Step-by-step explanation:

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What percent of 72 is 9? 1/8% 1 1/4% 12 1/2% 125%

USPshnik [31]

Answer:

$12\dfrac 12\%$

Step by step explanation:

$\text{Let it be}~ x\%,\\\\~~~~~72 \cdot x \% = 9\\\\\\\implies 72\cdot \dfrac{x}{100} = 9\\\\\\\implies x = \dfrac{9 \times 100}{72}\\\\\\\implies x = \dfrac{100}{8}\\\\\\\implies x = \dfrac{25}2\\\\\\\implies x = 12 \dfrac 12\\\\\\\text{Hence 9 is}~ 12\dfrac 12\% ~ \text{of}~ 72$