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
yanalaym [24]
2 years ago
5

NEED HELP ASAP, TEST!! Solve the equation 2 cos (x) +1=0,0 ≤ x ≤ 2pi. Show all of your work.​

Mathematics
1 answer:
Viefleur [7K]2 years ago
3 0

Answer: cos(x) = -\frac{1}{2}

Work:

1. Subtract 1 from both sides

2cos(x)+1-1=0-1

2. Simplify

2cos(x)=-1

3. Divide both sides by 2

\frac{2cos(x)}{2}=\frac{-1}{2}

4. Simplify

cos(x)=-\frac{1}{2}

You might be interested in
HELP FASTTTT Which graph shows the solution to the system of linear inequalities ?
Mice21 [21]
Well, we do not see the lines clearly (if they are dotted (inequality) or solid (inequality or equal) ), but we'll come back to this.

y<x+1  can be simplified to be y<x if we ignore the constants, so the valid part is BELOW the line, since (y<)

x-4y <=4
again, ignore the constants and simplify to 
x-y<0 or
y>x   so the valid part is ABOVE the line (since y>)

There are two graphs that satisfy BOTH conditions, pink (slope=1) at the bottom, and blue (slope = 1/4) on top, i.e. first and third graph.

For the absolute inequality (y<x+1), the red line must be dotted.
For the <= condition, the blue line must be solid.

As we cannot see the lines clearly, you will make the choice between the first and third graphs according to the previous paragraph.

4 0
3 years ago
Read 2 more answers
QUICK PLSS 1. Jabo orders a meal that cost $20.00.
Lelechka [254]

Answer:

$25.80

Step-by-step explanation:

Find the cost of the meal with the sales tax:

20 x 0.075 = 1.5

Add the sales tax to the total

20 + 1.5 = 21.50

Find the tip:

21.5 x 0.2 = 4.3

Add the tip to the total cost so far:

21.50 + 4.30 = 25.80

7 0
3 years ago
To find the area of a triangle, you can use the expression b × h ÷ 2, where b is the base of the triangle and h is its height. W
Zolol [24]

Answer:

16

Step-by-step explanation:

b x h is finding a square or rectangle, but since a triangle is half of a rectangle or square you can divide that by 2. So, 8 (b) x 4 (h) = 32, 32 / 2 = 16. Hope this helps! :D

6 0
2 years ago
Help , please and thanks
ira [324]

Answer:

891,962,172,409

try that

Step-by-step explanation:

5 0
3 years ago
On a scale drawing, which of the following has a scale of 1:6?
Alexandra [31]
The answer would be D, 2 cm represents 12 cm. 2/12=1/6
3 0
3 years ago
Read 2 more answers
Other questions:
  • 1. Un proyecto habitacional Una contratista de viviendas ha subdividido una granja en 100 lotes para construcción. Ella ha diseñ
    7·1 answer
  • Please help me please !!!
    14·1 answer
  • The circle given by x^2+y^2-6y-12=0 can be written in standard form like this: x^2+(y-k)^2=21 What is the value of k in this equ
    15·2 answers
  • What is the maximum volume of a pyramid that can fit inside a cube that has side 18 cm long?
    14·1 answer
  • Plot points at(o, 3), (o, 1), and(0,5). What is true about all points with an x-coordinate of 0?
    7·1 answer
  • 2xsquare-6x+3=0 by completing the square method ???
    9·1 answer
  • PLEASE HELP MEEEE UGH on 5
    8·2 answers
  • Sasha's sister has a checking account. If the account balance ever falls below zero, the bank charges her a fee of $6. 95 per da
    15·1 answer
  • Adwoa made fresh orange juice. If she used 2 oranges per a glass.How many oranges did she use?​
    6·2 answers
  • The fraction model below shows the steps that a student performed to find a quotient. Which statement best interprets the quotie
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!