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Alika [10]
3 years ago
8

PLEASE ANSWER ASAP

Mathematics
2 answers:
Oxana [17]3 years ago
6 0
The relationship is that cos 7pi/6 and cos 5pi/6 both are cosines of angles that have a reference angle of pi/6. cos 7pi/6 = cos 5pi/6 = -√3/2
hjlf3 years ago
5 0
It is known
 \dfrac{\pi}{6} =30^{\circ} and 
 \cos \dfrac{\pi}{6}= \dfrac{ \sqrt{3} }{2} (if you want to determine cosine of 30° you should draw the perpendicular line to the x-axis and find the point of intersection, the value of x-coordinate is the cosine of 30°).

The angle \dfrac{5\pi}{6} =150^{\circ} and
\cos \dfrac{5\pi}{6}=- \dfrac{ \sqrt{3} }{2} (see image).
The angle \dfrac{7\pi}{6} =210^{\circ} and

\cos \dfrac{7\pi}{6}=- \dfrac{ \sqrt{3} }{2} (see image).


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there are 121 boys and 116 girls signed up for a felid trip the leader first makes grops of nine students and assign the remaini
valentina_108 [34]

Answer:

22 groups of ten

Step-by-step explanation:

121 plus 116 = 237

237 - 9 = 228

lets split 228 into parts

200

20

8

there are 20 groups of ten in 200

2 groups of ten in 20

and 8 has 0 it is a remainder

20 groups plus 2 groups = 22

22 groups of ten

this probobly isn't the easiest way but I don't know how but this is my thought process.

8 0
3 years ago
Which of the pairs of ratios are equivalent? A) 12: 24, 50 :100 B) 16 to 3,27 to 5 C) 22/1, 68/3 D) 3/7, 17/35
RoseWind [281]

Answer:

A

Step-by-step explanation:

equivalent because each are 1:2

3 0
3 years ago
Problems that require solving the three-dimensional schrödinger equation can often be reduced to related one-dimensional problem
dusya [7]
The wavefunction for a particle in a one-dimension box is a well-known problem, which has as a solution:

Ψ(x) = √(2/l) sin (nπx/l)

When the box has three dimensions, the general solution is simply the multiplication of the solutions for each dimension, therefore:

Ψ(x) = K · sin (n_x·π·x / l) · sin (n_y·π·y / l) · sin <span>(n_z·π·z / l)</span>
8 0
3 years ago
Help me with 1-8 please!
alexandr1967 [171]
1) you do 144× 12 since you want to know how much all kids pay so its 1728 dollars.

2) they want 2 section a, 3 section b, and 2 section c, and sincc you want to know total you multiply number of tickets bought by cost per ticket, so its 2(10)+3(20)+2(30)=180 total cost.

3) sine they have 350 dollars yoy subtract cost of the ps4 from the amount they have and you get, 350-234=116 dollars remaining.


4) since they make 15 per lawn you write 15x, x representing number of lawns cut, and you set that equal to 225, so its 15x=225 then you divide 15 on both sides to get x= 15 lawns they need to cut.

5) you just divide 2/4 since they ate two of four slices and you get .5 then convert that to a decimal by moving decimal point 2 spaces over to get 50%.

6) Just add up all the costs of each song, so you get .99+1.19+1.5+.99 = 4.67 dollars as total cost.

7) since 60 min is in an hour and you have 30 min left over it would be 1hr and 30 min.

8) since its Monday through Friday which is only 5 days you multiply that by 4 weeks to get 20 days then you multiply by 30 since they study 30 min on each of those days, so you get 20×30 which is 600min of studying, but since it want is in hours divide 600 by 60 to get 10hrs of study.
3 0
3 years ago
Please answer question number 10
harina [27]

Answer:

In 20 days he will waste 20 * 1/2 = 10 rotis . They have consumed 110 rotis in 20 days , so they have taken 110 + 10 = 120 rotis. (10 are wasted). Rosa ate x rotis and Varun ate 2x rotis . So x + 2x = 120 ⇒ 3x = 120 ⇒ x = 120/3 ⇒ x = 40

Varun ate 80 (2x) and Rosa ate 40 (x)

Step-by-step explanation:

8 0
3 years ago
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