can someone help me with this question lol, i’ll mark as brainliest if correct
Answers
Hi there! Before we start with your problem. Recall the Trigonometric Function of (-x) first.
sin(-x) = -sinx cos(-x) = cosxtan(-x) = -tanxNow what we need to do is to imagine a unit circle. We know that angle (-x) rotate clockwise while (x) rotates counterclockwise.
Now imagine if it rotates clockwise, it:d start at the fourth quadrant first. That means the y-value is negative while x-value is positive.
We also know that (x, y) = (cos, sin)
Now move to the 2(pi)/3.
[tex] \large{ \frac{2 \pi}{ 3} = \frac{2(180)}{3} \longrightarrow 2(60)= \boxed{120 \degree}}[/tex]
Thus, the value of 2pi/3 is 120°
Now imagine again. In a unit circle, 120° is in second quadrant if we rotate counterclockwise. But if we rotate clockwise, where would the 120° be? Remember that (-x) rotates clockwise. That's right! (-120°) is in the third quadrant. In the third quadrant, cos is negative there along with sin.
So we can conclude that:
cos(-120°) is in third quadrant. cos and sin are negative in third quadrant.120° is also a reference angle of 60° because of 180°-60° = 120°
Thus,
[tex] \large{cos( - \frac{2 \pi}{3} )= cos( - 120 \degree) = cos(120 \degree) \longrightarrow - \frac{1}{2} }[/tex]
Answer/Conclusions
cos(-2pi/3) = -1/2cos(-2pi/3) use the reference of 60°cos(-2pi/3) is in third quadrant.Related Questions
A scuba diver studying marine life is 4 feet below sea level. From that depth, the diver descends 72.5 feet to the ocean floor. He then rises to 6.25 feet. He rests there. Where is the diver relative to sea level when he is resting?
Create a number sentence and find the value where the diver is resting.
Answers
“−66.25”
Explanation:
I did “ -72.5 + 6.25” I put a “-“ because the question says “below sea level” so that means that it’s a negative number. And the answer is “−66.25”
I’ll mark as brainliest if correct, thanks!
Answers
Answer:
1. (J+s)÷2
2. (C·4)+i
3. (M+a)4
4. G-125
Step-by-step explanation:
The scatter plot with trend line below shows the data comparing wind speed and wind
The equation of the trend line is y = -0.36x + 12.6.
Use the equation of the trend line to predict the wind chill for a wind speed of 1 mi/h. Round your answer
to the nearest degree.
The wind chill at 1 mi/h is
°F.
Answers
Answer:
12
Step-by-step explanation:
Find area and circumference of the circle please!! I need help!!! :(
Answers
Answer:
radius r = 12 in
diameter d = 24 in
circumference C = 75.3982237 in
area A = 452.389342 in2
Step-by-step explanation:
An altitude is drawn from the vertex of an isosceles triangle, forming a right angle and two congruent triangles. As a result, the altitude cuts the base into two equal segments. The length of the altitude is 30 inches, and the length of the base is 10 inches. Find the triangle’s perimeter. Round to the nearest tenth of an inch.
Answers
Step-by-step explanation:
From the given question, applying the Pythagoras theorem to one of the congruent triangles formed, we have;
= +
= +
=841 + 81
= 922
hyp =
= 30.3645
The perimeter of the triangle can be determined as;
perimeter = + +
= 30.3645 + 18 + 30.3645
= 78.729
The perimeter of the triangle = 78.7 inches
The perimeter of the triangle is 70.82 inches.
Given as :
The length of the altitude is 30 inches, and
The length of the base is 10 inches
What is right triangle?Right triangle is defined as a triangle which one angle is a right angle or two sides are perpendicular.
Let, perpendicular = 30 and base = 5
According to Pythagoras theorem,
A right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.
perpendicular² + base² = hypotenuse²
Substitute the values,
30² + 5² = hypotenuse²
900 + 25 = hypotenuse² or
hypotenuse² = 925
hypotenuse = √925
hypotenuse = 30.41
The perimeter of the triangle can be determined as:
Perimeter of the triangle = l₁ + l₂ + l₃
Perimeter of the triangle = 30.41+ 10 + 30.41
Perimeter of the triangle = 70.82
Hence, the perimeter of the triangle is 70.82 inches.
Learn more about right triangle here:
brainly.com/question/6322314
#SPJ2
PLEASE ANSWER I WILL GIVE BRAINLIEST!! (trolls get banned)
Answers
Answer:
LMK is 30
Step-by-step explanation:
inside the triangle, the LMN is the equation 3x=90degrees
under the KN is 4x
on the left is 150dgrees = 5x
3x+4x+5x=360
add the x's together
12x=360
divide
x=30
LMK= 150-90/2=60/2=30
help please I ONLY HAVE TODAY
Answers
Answer:
1) it should be
[tex] \frac{1}{ {8}^{6} } [/tex]
2) To avoid making this mistake remember that when you subtract 4-10 you get -6 and you can't have a negative exponent so you have to move it to the denominater for it to be positive.
Help please. Geometry.
Answers
Help question is in the pic PLEASE EXPLAIN HOW YOU GOT THE ANSWER!
Answers
Answer:
Step-by-step explanation:
3
Answer:
Part A is 64
Step-by-step explanation:
i dont know part B yet
Can someone help me with these problems
Answers
Answer:
Number 3
A= -6
B= the third one
4. for this one, just do -1, 0, 1, 2, 3, 4
3b: 6>9
4th: i don’t understand sorry
Please answer this ASAP
Answers
Answer:
1. 22
2. 16
3. -43
4. -8
D
This is not all the answers
what are The numbers that mark any location on a coordinate plane called? HELP DUE 10 MINSSS
Answers
Answer:
The numbers that mark any location on a coordinate plane are called 'points'.
Answer:
Points on the plane are located using two numbers - the x and y coordinates.
Step-by-step explanation:
Yun was trying to factor 7x^2-14x. He found that the greatest common factor of these terms was 7x and made an area model. What is the width of Yun's area model?
Answers
Answer:
DO YOU STILL NEED HELP?
Step-by-step explanation:
Answer:
x-2
Step-by-step explanation:
dividing 7x^2-14x by 7x we get x-2
Can I get some help?
Answers
Answer:
A
Step-by-step explanation:
8x (the babysitter gets paid 8 dollars an hour, and x represents number of hours)
3 (this is the additional tip the babysitter gets; it's not dependent on the number of hours she/he works)
The babysitter will get paid the same despite babysitting two kids- no variable here is dependent on the amount of kids the babysitter babysits.
Answer:
A) 8x + 3
Step-by-step explanation:
The babysitter gets 8 dollars per hours, and x is the hours, so 8x, 8 dollars per hour. She also gets 3 dollars if she gets the children to sleep on time, so add 3. The equation is 8x + 3.
There are 6 boys and 8 girls in a classroom. What is the probability that the teacher randomly selects a boy
Answers
Answer:
3/7 is the probability that the teacher will randomly select a boy.
Hope this helps! :)
The probability that the teacher randomly selects a boy is 3/7
How to determine the probability?The given parameters are:
Boy = 6
Girls = 8
The total number of students is:
Total = 6 + 8 = 14
The probability of selecting a boy is:
P(Boy) = 6/14
Simplify
P(Boy) = 3/7
Hence, the probability that the teacher randomly selects a boy is 3/7
Read more about probability at:
https://brainly.com/question/25870256
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Multiply
132.71 x 10 with the power of 2
Answers
Step-by-step explanation:
132.71 x 10 with the power of 2 = 13271
Point M (2,4) was dilated to M'(9,18). What was the scale factor, and was the dilation an enlargement or reduction? Please hurry! this is due tomorrow
Answers
Answer:
the scale factor was 9/2 or 4.5
please mark brainliest <3
Again help!!!!!!!!!!!!!!!
Answers
Answer:
where is the picture of the table?
Step-by-step explanation:
the first image is the question the second is the answer, and i need the in between of how the heck do i do this. the final is tmrw please help!
Answers
Answer:
Step-by-step explanation:
sir in the graph every point is (X,Y) so you should choose consecutive random numbers for the X values for the first point after that put the values you choose In the equations so now you have just numbers in the equation .. add, subtract and multiply at the end you will get a value .. ok this Y for the first point .. mark this point on the graph and continued this process until it reached at least 3 points, and connected between them.
Note : do this with each equation separately and do not connecte between two points for two different equations
the equation with x will become as line
the equation with x² will become as arch
after you finsh drwaing see the points that the tow equation are touching within and write them. Usually it is two points
Step-by-step explanation:
First, set the equations as equal to eachother because both equal y:
[tex]x^2-6x-7=x+1[/tex]
Now, solve to get everything on one side of the equation so that the other side of the equation is set to 0:
[tex]x^2-7x-8=0[/tex]
Now use the sum product pattern:
[tex]x^2+x-8x-8[/tex]
(as you can see, the above equation is equivalent to the previous equation, but there are now four values instead of three)
Now take the common factor from the two pairs:
[tex]x(x+1)-8(x+1)[/tex]
Rewrite in factored form:
[tex](x-8)(x+1)[/tex]
Now to get both values of x, set each factored equation to 0 and solve for x (becuase remember, the equation still equals 0):
[tex](x-8)=0\\x=8[/tex]
[tex](x+1)=0\\x=-1[/tex]
NOW that we have both values of x, we can subsitute them into EITHER equation and solve to get the corresponding y values:
[tex]y=(8)+1\\y=9[/tex]
[tex]y=(-1)+1\\y=0[/tex]
So that's how we solve to get these coordinates: (8,9) & (-1,0).
Good luck on your final and I hope I was able to help :)
jack has a jar of coins. there are 12 pennies 3 nickels 9 dimes and 6 quarters in the jar. f Jack randomly chooses a coin from the jar, what is the probability that he chooses a nickel?
Answers
Answer:
Step-by-step explanation:
11%
Which expression represents 12 times a number, n, minus 6?
A. 12n – 6
B. 12 – 6n
C. 12 + n – 6
D. 12n – 6n
Please do step by step explanation for branliest.
Answers
Answer:
A. 12n - 6
Step-by-step explanation:
12 times a number which is n so
12n then minus 6 ,
12n-6
hope this helps
Someone help immediately please!
Answers
for question 1
Area of Base B =45×25 = 1125 cm²
perimeter of base P = 2(45+25) = 140 cm
Height = 15 cm
Using the formula
Surface area = 2B + Ph
A = 2×1125 + 140×15= 4350 cm²
Voume = Bh = 1125×15= 16875 cm³
For question 2,
Area of base = 7× 5/2= 17.5 cm²
Perimeter of base = (7+7+7) = 21 cm
Surface area = 2B + Ph
Surface area of prism = 2×17.5+ 21×10 = 245cm²
Volume = Bh = 17.5×10 = 175 cm³
Answer:
Step-by-step explanation:
for question 1
Area of Base B =45×25 = 1125 cm²
perimeter of base P = 2(45+25) = 140 cm
Height = 15 cm
Using the formula
Surface area = 2B + Ph
A = 2×1125 + 140×15= 4350 cm²
Voume = Bh = 1125×15= 16875 cm³
For question 2,
Area of base = 7× 5/2= 17.5 cm²
Perimeter of base = (7+7+7) = 21 cm
Surface area = 2B + Ph
Surface area of prism = 2×17.5+ 21×10 = 245cm²
Volume = Bh = 17.5×10 = 175 cm³
LAST ONE LUVS:) thx for all the help!!
Answers
Answer:
hi
Step-by-step explanation:
A is 50 and B is 10
then, C is 5
50+10=60
50-10=40
50÷10=5
have a nice day
Answer:
Step-by-step explanation:
A+B=60
A=60-B
substitute the value of A in
A-B=40
60-B-B=40
60-40=2B
20/2=B
10=B
Now, substitute the value of B in
A+B=60
A+10=60
A=60-10
A=50
A/B=C
50/10=C
5=C
What is the value of P ?
Answers
Answer:
p=28.3
Explanation:
75.8-47.5=28.3
Pls help will give brainlest if it’s right :)
Answers
Answer:
x = 225
Explained:
(27 + 48)*3 = x
I hope this is right.
Show your work !
[(12 ∙ 3) + 6] - 32 ÷ (9 - 6)
Answers
Answer:
[tex][(12 ∙ 3) + 6] - 32 ÷ (9 - 6) \\ = 42 - 3 {}^{2} \div 3 \\ = 42 - 3 \\ = 39[/tex]
Answer:
12.3+6= 18.6
9-6= 3
18.6 - 32 = 4.6
4.6÷3= 1.5
An artist uses four distinct colors in his latest painting–red, blue, green, and yellow–
with ounces used in a ratio of 10:22:4:18, respectively. The artist used a total of 189 ounces
of paint to complete the piece. How many ounces of blue paint did he use?
A. 59
B. 65
C. 68
D. 77
Answers
Answer:
D, 77
Step-by-step explanation:
Answer:
pp
Step-by-step explanation:
After travelling a distance of 35km, Vijay found that km of his journey was still
left. What was the length of his whole journey ?
Answers
Answer:
how much km was left
Step-by-step explanation:
his whole journey length would be if u add both km
Can i have some help?
Answers
Answer:
uh... sure.
The correct answer should be B, C, E
Step-by-step explanation:
inequalities are stuff like 4x > 2x or 1 < 2
rhombus measurement help
Answers
Answer:
5. D 6. B 7. A
Step-by-step explanation:
it is just like a square all sides are the same