All categories

3 years ago

Identifying the reference angles

Mathematics

2 answers:

frutty [35]3 years ago

6 0

Answer:

Step-by-step explanation:

Tema [17]3 years ago

5 0

A reference angle is the angle closest to the x-axis from the given angle.
Also called t-bar, a t with a bar over it. Reference angles are always POSITIVE.

Theta = 300, you can continue around to 360, or go back to 180. Going to 360 would be 60 degrees and going back to 180 would be 120 degrees. Therefore, the reference angle would be 60 degrees.

Theta = 225: 360 - 225 = 135; 225-180 = 45; t-bar = 45 degrees

Theta = 480; This angle has already made a full revolution (360) and is on the second revolution. It is coterminal to 120 degrees. 180-120 = 60 degrees;
120-0 = 120 degrees. t-bar = 60 degrees.

Theta = -210. -120 just means you are moving clockwise instead of counterclockwise.
180-120 = 60 degrees; 120- 0 = 120 degrees; t-bar = 60 degrees

You might be interested in

CAN YOU PLEASE HELP ASAP!?

MAVERICK [17]

Apples went up 0.75 a lb

p is the start price so new price is p + 0.75

we buy 3 lbs

3 ( p+ 0.75) = 5.88

now solve

3p + 2.25 = 5.88

-2.25 -2.25

3p = 3.63

/3 /3

p = 1.21 a lb

4 0

3 years ago

Read 2 more answers

On a rectangle hyperbola, if one point is (2,3) and y varies inversely to x, find y when x is 6

s344n2d4d5 [400]

<span>The graph of y against x in inverse proportion is a rectangular hyperbola but I don't see at all how this knowledge/observation is any help in solving the problem.

Inverse proportion means that as x doubles y will halve and the equation is xy = k where k is some number. A good example of inverse proportion is speed and time taken over some fixed distance. In this case x could represent the speed (mph) and y the time (h) and then k is the distance in miles.

Since we know y=3 when x=2 we have xy = 6. Now it's easy to see when x=6 y=1.</span>

4 0

3 years ago

a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval

il63 [147K]

We cannot calculate the confidence interval without the sample size. However, for the second question, the sample size needed would be 49.

The formula we use is

$n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2$

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
$n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49$

6 0

3 years ago

40 points PLZ HELP!

tiny-mole [99]

Answer:

178

Step-by-step explanation:

4 0

3 years ago

A recipe requires 5 cups of sugar you can only measures using 3/4 cups how many 3/4 cups are needed for the recipe leave the ans

Firdavs [7]

Answer:

Step-by-step explanation:

5 / (3/4) =

5 * 4/3 =

20/3 <==== I left it as an improper fraction

6 0

3 years ago