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3 years ago

Q#1. If cos = -1/2 and 90 < x < 180, what is sin(x - 30)

Mathematics

1 answer:

leonid [27]3 years ago

7 0

Try this solution (this is not the only way!):

Q1: if cosx=-0.5 and x∈(90;180), it means x=120°.

So, sin(x-30)=sin(120-30)=sin90°=1.

<u>answer</u>: 1.

Q2: it tgx= -1/√3 and x∈(270°;360°), it means x=330°.

So, sin(x+30)=sin(330+30)=sin360°=0.

<u>answer</u>: 0.

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iVinArrow [24]

Answer:

hundredths; 81.73

Step-by-step explanation:

If the number underlined is two, then it will rounding to the hundredths place. Since the number after it is 7, which is greater than 5, we get 81.73.

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2 years ago

6+2x=48 what would the answer be?

Reika [66]

X=21 because 2x21=42+6=48

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4 years ago

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!! i don’t understand:(!!Frank estimated the height of his office building to be 35 ft. The actual height of his office building

MA_775_DIABLO [31]

Answer:

See explaination and answer below

Step-by-step explanation:

Absolute Error:

ae = | E - A |

ae = | 35ft - 33ft|

ae = 2 ft

Percent Error:

pe = 100% * | E - A | / A

pe = 100% * | 35ft - 33ft | / 33ft

pe = 6.06% error

EDIT: 6.1% if asked to the nearest tenth.

Please mark brainliest if this helped!

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3 years ago

TIMED HURRY!! What is the sum of the series

Hoochie [10]

$\\ \rm\Rrightarrow \sum^{60}_{n=1}3n$

It will form a arithmetic sequence as

$\\ \rm\Rrightarrow 3(1)+3(2)+3(3)\dots 3(60)$

Common difference=6/3=2
First term=a=3
Last term=3(60)=180
n=60-1=59

Summation

$\\ \rm\Rrightarrow \dfrac{n}{2}(a+\ell)$

$\\ \rm\Rrightarrow \dfrac{59}{2}(3+180)$

$\\ \rm\Rrightarrow \dfrac{59}{2}(183)$

$\\ \rm\Rrightarrow 5398.5$

Option C

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kicyunya [14]

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