1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mart [117]
3 years ago
11

HELP ME!!!

Mathematics
1 answer:
andrew11 [14]3 years ago
6 0

Answer:

210 is the only choice I see listed that works.

Step-by-step explanation:

I don't know if you know this but you can apply a co-function identity here giving you the equation:

cos(x)=-\frac{\sqrt{3}}{2}.

If you are unsure of the identity sin(90-x)=cos(x) then I can show you another identity that leads to this one.

The difference identity for sine is sin(a-b)=sin(a)cos(b)-sin(b)cos(a).

Applying this to sin(90-x) gives you sin(90)cos(x)-sin(x)cos(90).

Let's simplify that using that sin(90)=1 while cos(90)=0:

sin(90-x)=sin(90)cos(x)-sin(x)cos(90)

sin(90-x)=1cos(x)-sin(x)(0)

sin(90-x)=cos(x)

You can also prove this identity using a right triangle like the one in this picture:  

That missing angle is 90-x since we need the angles in this triangle to add up to 180 which it does:

(x)+(90)+(90-x)

x+90+90-x

x-x+90+90

0+180

180

Anyways you should see that sin(90-x)=b/c while cos(x)=b/c.

Since they are equal to the same ratio, then you can say sin(90-x)=cos(x).

There are other co-function identities you can get from using this idea.

Anyways back to the problem.

We are solving:

cos(x)=-\frac{\sqrt{3}}{2}.

It looks like you have a drop-down menu with answers ranging from 0 to 360.

So I'm going to answer in degrees using the unit circle.

cosine value refers to the x-coordinate.

We are looking for when the x-coordinate is -\frac{\sqrt{3}}{2} which is at \theta=150^\circ , 210^\circ.

You might be interested in
Suppose you have $5000 to invest. A certificate of deposit (CD) earns 6% annual interest, while bonds, which are more risky, ear
dimulka [17.4K]

$2000*6%= what and $3000*8%=? i have given you the answer without solving it for you but the answers to these add up to 360 but i still however want you to find out what each one equals by itself.
8 0
3 years ago
176.59 in word form​
lorasvet [3.4K]

Answer:

one hundred seventy-six and fifty-nine hundredths

Step-by-step explanation:

3 0
2 years ago
I need help ASAP. show work. So I can learn :)
damaskus [11]

it would be a because nothing else makes sense

3 0
2 years ago
Please help me I don't know how to do it
poizon [28]
Findd total collected
add everybody
fri+sat+sun+mon=
21+5 and 5/6+2.75+4 and 5/8
add what you can
21+5+2.75+4+5/6+5/8=
28.75+5/6+5/8
add the fractions by making denom same
5/6+5/8=20/24+15/24=35/24=1 and 9/24=1 and 3/8
28.75+1 and 3/8=29.75+3/8
that is how many barels total
times 205 since that is how many litesr in each bottle
205 times (29.75+3/8)=
205*29.75+205*(3/8)=
6098.75+76.875=
6175.625

29/30 is lost

1//30 remains
9175.625 times 1/30 (aka divided by 30)=205.854166666666666 litesr
205 bottles (and 0.85 partially full bottle)
3 0
3 years ago
31. Each day, Talisa exercises by first
GaryK [48]

Answer:

Step-by-step explanation:

Given the following :

Laps - - - - - - - - 5 - - - 6 - - - 7 - - - 8 - - - 9

Total time - - - 25 - - 28 - - 29 - - 30 - - 32

Using online graphing tool:

The y - axis named dependent variable represents the total time taken.

The x-axis, represents the number of laps.

The equation of the trend line attached to the plot is in the form :

y = mx + c

y = 1.6x + 17.6

Where y = total time taken

x = number of laps

m = 1.6 = gradient of the line (change in y / change in x)

C = 17.6 = intercept (whee the trndline intersects the y-axis).

5 0
3 years ago
Other questions:
  • Five times Carl's age plus three times Jill's age equals 110. Jill's age is also two times Carl's age. How old is Carla ?
    5·1 answer
  • What is the first step in finding the unit price on a box of 20 pencils?
    14·1 answer
  • (06.06 MC) The work of a student to find the dimensions of a rectangle of area 8 + 12x and width 4 is shown below:
    5·1 answer
  • In a test tube, you have 4ML of oil and 6 ML of water. What percentage of the liquid is oil?
    11·2 answers
  • Hey y’all can y’all plz help me for brainliest
    11·1 answer
  • Help me if you are good at finding areas please? A sticker on the rear window of a truck is rectangular in shape with two green
    5·2 answers
  • Mrs. Jensen, the science teacher, collected 30 sedimentary rocks and 42 metamorphic
    6·1 answer
  • A page was missing from a 72 - page book. When Josh added up the remaining page numbers, the sum was 2521. Which page was missin
    15·1 answer
  • Nathaniel works as a baker and makes several batches of muffins every morning. each batch requires 1 1/7 cups of sugar. for a la
    11·1 answer
  • Let f(x)=3x+1 and g(x)=x^2+xAfter simplifying (fg)(x)
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!