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3 years ago

How to write this numbers in word 30.659

Mathematics

1 answer:

Karo-lina-s [1.5K]3 years ago

6 0

Answer:

thirty and six hundred fifty-nine thousandths

Step-by-step explanation:

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Solve 2cos^2x+3cosx-2=0

solmaris [256]

$\bf 2cos^2(x)+3cos(x)-2=0\impliedby \textit{so, notice is just a quadratic}
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[2cos(x)~~-~~1][cos(x)~~+~~2]=0\\\\
-------------------------------\\\\
2cos(x)-1=0\implies 2cos(x)=1\implies cos(x)=\cfrac{1}{2}
\\\\\\
\measuredangle x=cos^{-1}\left( \frac{1}{2} \right)\implies \measuredangle x=
\begin{cases}
\frac{\pi }{3}\\\\
\frac{5\pi }{3}
\end{cases}\\\\
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cos(x)+2=0\implies cos(x)=-2$

now, for the second case, recall that the cosine is always a value between -1 and 1, so a -2 is just a way to say, such angle doesn't exist.

8 0

3 years ago

on the first four days of the week, Ella took 30 min 28 min 34 min and 31 min to get to school if the average for the week is 31

Mila [183]

It took 32 minutes for Ella to go to school on Friday.

Step-by-step explanation:

Time for first four days in minutes,

30,28,34,31

Let x be the time on Friday

Average = 31 min

As we know

$Average = \frac{Sum\ of\ term}{No.\ of\ terms}\\Average=\frac{30+28+34+31+x}{5}\\31=\frac{123+x}{5}$

Multiplying both sides by 5;

$5*31=\frac{123+x}{5}*5\\155=123+x\\x+123=155\\x=155-123\\x=32$

It took 32 minutes for Ella to go to school on Friday.

Keywords: Average, Addition

Learn more about addition at:

#LearnwithBrainly

5 0

4 years ago

What is the inverse of f(x)=(x−5)^2 for x≥5 where function g is the inverse of function f?

Alexxandr [17]

Answer:

f-1(x) = √x. +5

Step-by-step explanation:

f(x) = (x-5)^2

x = (y-5)²

√x = y-5

√x +5 = y

7 0

3 years ago

Encuentra la medida del segmento AB conociendo que : DE//BC medida del ángulo EDA=90 grados ,AD=2cm,DE=3cm y BC=18cm

OverLord2011 [107]

Hii its charli damelio

5 0

3 years ago

K<br> The solution is k<br> K/6+5=17<br> The solution is k=

aleksklad [387]

k=72

Explanation:

72/6=12

12+5=17

3 0

2 years ago

Read 2 more answers

How to write this numbers in word 30.659​

How to write this numbers in word 30.659