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3 years ago

What is cos 30°? 60° 1 90° 30° V3 O A. v3 O B. 1 O c.

Mathematics

2 answers:

siniylev [52]3 years ago

4 0

Answer:

D. 1/2

Step-by-step explanation:

yKpoI14uk [10]3 years ago

4 0

Answer:

Step-by-step explanation:

Cos=Adjacent/hypotenuse

Cos30=rad3/2

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One has heels and one dosent your on your own 252

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3 years ago

The table below represents the closing cost of ABC for the last 5 days. What is the r -value of the linear regression that fits

Gnoma [55]

Answer:

The correct option is D.

Step-by-step explanation:

The linear regression equation is in the form of

$y=bx+a$

Where,

$b=\frac{n(\sum xy)-(\sum x)(\sum y)}{n(\sum x^2)-(\sum x)^2}$

$a=\frac{(\sum y)(\sum x^2)-(\sum x)(\sum xy)}{n(\sum x^2)-(\sum x)^2}$

The formula of r is

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n(\sum x^2)-(\sum x)^2][n(\sum y^2)-(\sum y)^2]}}$

The values are

$\sum x=15,\sum y=98.91,\sum x^2=55,\sum y^2=1957.8295,\sum xy=293.78, n=5$

Using above formula, we get

$r=-0.85650$

Therefore option D is correct.

3 0

3 years ago

Read 2 more answers

Ms.fox asked her class is the sum of 4.2 and the square root of 2 rational or irrational

goldfiish [28.3K]

It is irrational. Otherwise sqrt(2) would be rational too which is not true.

3 0

3 years ago

Evaluate : 5-3(x-1) when x=7

Andrei [34K]

Answer:

<h3> $\boxed{ \bold{ \boxed{ \sf{ - 13}}}}$ </h3>

Step-by-step explanation:

Given , x = 7

let's find :

$\sf{5 - 3(x - 1)}$

Plug the value of x

⇒ $\sf{5 - 3(7 - 1)}$

Subtract 1 from 7

⇒ $\sf{5 - 3 \times 6}$

Multiply the numbers

⇒ $\sf{5 - 18}$

Calculate

⇒ $\sf{ - 13}$

Hope I helped!

Best regards!!

7 0

3 years ago

Read 2 more answers

How to answer this questions

amm1812

Complementary is when angles equal 90 degrees.

supplementary is when angles equal 180 degrees.

a)

supp:145 degrees
comp:55 degrees

b)

supp:23 degrees
comp: none

c)

supp:159 degrees
comp:69 degrees

6 0

3 years ago

What is cos 30°? 60° 1 90° 30° V3 O A. v3 O B. 1 O c.​

What is cos 30°? 60° 1 90° 30° V3 O A. v3 O B. 1 O c.