Evaluate and simplify cos 2pi/3. The options for answers are in the picture attachment, but I have NO idea how to get any of them? Please, Any help is appreciated (:

Answers

Answer 1

Answer: when pi is inside the trigonometric function you can subs. it by 180 degree
so cos(2*180/3) = cos(120) = -0.5

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3x + 2y = 24.00

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Answers

I believe the answer is 5.15 .

Answer:

Its D 5.25

Step-by-step explanation:

Just took the test

Work out (25/9) to the power of -3/2

Answers

To work out (25/9) to the power of -3/2, we can use the property of exponentiation. The negative exponent signifies taking the reciprocal of the base raised to the positive exponent. Additionally, the fractional exponent indicates taking the square root of the base raised to the numerator and then taking the reciprocal of the result raised to the denominator. Let's calculate it step by step.

How to solve parabola

Answers

standard form: ax^2+bx+c

vertex form: a(x-h)^2+k

i hate parabolas. i can't remember the equation. sorry.

Find n.
30/38= 15/n
n=______

Answers

multiple 38 with 15 and divide the result with 30 n = 19

Answer:

Step-by-step explanation:

Sample annual salaries (in thousands of dollars) for public elementary school teachers are listed. Find the sample standard deviation. Round to two decimal places if necessary 23.9
15.3
40.2
30.3
21.0
22.8
ID: ES6L 2.4.1-9+

Answers

Answer:

The standard deviation is 9.34

Step-by-step explanation:

First we need to find mean of the sample:

$m=(23.9+15.3+40.2+30.3+12+22.8)/6=24.08$

Standard deviation will be like below:

$d=√((x-m^2)/6)=9.34$

1/7 times x = 1
5/4 times x=1
3 1/2 times x=1
5/7 times x=1

Answers

( i )

$= > (1)/(7) * x = 1 \n \n \n \n = > (1)/(7) * 7 * x = 1 * 7 \n \n \n \n = > x = 7$

( ii ) :

$= > (5)/(4) * x = 1 \n \n \n \n = > (5)/(4) * (4)/(5) * x = 1 * (4)/(5) \n \n \n \n = > x = (4)/(5)$

( iii ) :

$= > 3(1)/(2) * x = 1 \n \n \n \n = > (7)/(2) * x = 1 \n \n \n \n = > (7)/(2) * (2)/(7) * x = 1 * (2)/(7) \n \n \n \n = > x = (2)/(7)$

( iv ) :

$(5)/(7) * x = 1 \n \n \n \n = > (5)/(7) * (7)/(5) * x = 1 * (7)/(5) \n \n \n \n = > x = (7)/(5)$

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