Given:
\(sin\theta=\frac{2\sqrt{3}}{5},\text{ and }\frac{\pi}{2}<\theta<\pi\)It's required to find cos 2θ.
We use the formula:
\(cos(2\theta)=1-2sin^2\theta\)Substituting:
\(cos(2\theta)=1-2(\frac{2\sqrt{3}}{5})^2\)Operating:
\(\begin{gathered} cos(2\theta)=1-2*\frac{4*3}{25} \\ cos(2\theta)=1-\frac{24}{25} \\ cos(2\theta)=\frac{1}{25} \end{gathered}\)Answer: 1/25
A researcher estimates that a fossil is 3200 years old. Using carbon-14 dating, a procedure used to determine the age of an object, the researcher discovers that the fossil is 4000 years old. A. Find the percent error. B. What other estimate gives the same percent error?
A. The percent error is 25%
B. Another estimate that gives the same percent error is the Theoretical value.
How to Find the Percent Error?A. To find the percent error, we use the following formula:
percent error = (|experimental value - theoretical value| / theoretical value) x 100
In this case, the experimental value is 4000 years (from carbon-14 dating) and the theoretical value is 3200 years (from the researcher's estimate). Plugging these values into the formula:
percent error = (|4000 - 3200| / 3200) x 100 = (800 / 3200) x 100 = 25%
B. To find an estimate that gives the same percent error, we can use the formula:
Theoretical value = experimental value / (1 + percent error / 100)
If we use the same percent error (25%) and experimental value (4000 years) as before:
Theoretical value = 4000 / (1 + 25/100) = 4000 / 1.25 = 3200
So, an estimate of 3200 years would give the same 25% percent error as the researcher's original estimate.
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Out of 260 racers who started the marathon, 232 completed the race, 25 gave up, and 3 were disqualified. What percentage did not complete the marathon?
Answer:
9
Step-by-step explanation:
You're looking for the percentage that "did not complete the marathon" So take the 25 that gave up and the 3 that were disqualified and add those. Then divide 260 by your sum of those groups. Your expresssion should be 260/28 which gives you the decimal 9.28571429. Your answer would be 9 because this question doesn't ask for a decimal answer.
Assuming no denominator equals zero which expression is equivalent to the given expression
From the problem :
\(\frac{\frac{r-5}{9r}}{\frac{5-r}{3r^2}}\)We can rewrite the expression as multiplication :
\(\begin{gathered} \frac{r-5}{9r}\times\frac{3r^2}{5-r} \\ \Rightarrow\frac{-(5-r)}{9r}\times\frac{3r^2}{5-r} \\ \Rightarrow-\frac{r}{3} \end{gathered}\)The answer is C -r/3
A self-serve car wash charges $5.20 to use its facilities, plus an additional $0.66 for each minute the customer is at the self-serve car wash. If Tiffany was at the car wash for 9 minutes, how much was she charged?
A.$11.14
B.$14.20
C.$5.94
D.$5.86
The required amount charged to Tiffany for 9 minutes of the car wash is $11.14. Option A is correct.
What is simplification?The process in mathematics to operate and interpret the function to make the function or expression simple or more understandable is called simplifying and the process is called simplification.
Here,
The additional charge for the time Tiffany was at the car wash was $0.66 per minute, so the total charge for 9 minutes would be
= $0.66 * 9
= $5.94.
Adding this to the original charge of $5.20 gives a total charge,
= $5.20 + $5.94
= $11.14.
Therefore, Tiffany was charged A) $11.14.
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The bill for dinner at zolos restaurant is $32.75. You decide to leavr a 17% gratuity. What is the total amouny of money that you will pay?
Answer:
you would pay $32.92 in total
solution:
17/100=0.17
hence,$32.75+0.17=$32.92
use the numbers -10, -5/2,-2/5, or 5 to write an expression
Using only two of the numbers, write a division expression with a quotient greater than 10
The answer is -10 ÷ (-2/5)
The required expression will be -10 ÷ (-2/5).
What is an expression?Numbers, symbols and operators grouped together that show the value of something.
Given are the numbers -10, -5/2,-2/5, or 5
Using the numbers,
-10 ÷ (-2/5).
Hence, -10 ÷ (-2/5) will be the expression.
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What is the slope? Please Help
Answer:
-1
Step-by-step explanation:
Pick two points on the line
(0,2) and (2,0)
Using the slope formula
m = ( y2-y1)/(x2-x1)
= ( 0-2)/(2-0)
= -2/2
= -1
Answer:
-1
Step-by-step explanation:
Use two points on the line to find the slope, using rise over run.
We can use the points (0, 2) and (2, 0).
From the first point to the other, the y value decreases by 2 and the x value increases by 2.
Use rise (change in y value) over run (change in x value):
-2 / 2
= -1
So, the slope is -1.
Use the distributive property.
Simplify the expression below.
5(x - 2) =_-_
~\(\frak{LoveYourselfFirst:)}\)
Hey there!
Do you remember what the Distributive property states? If not, no worries! Here's what this property states:
a(b+c)=ab+ac
In this formula, a, b, and c can be
Constants. These are numbers like 1, 2, 3, or -1, -2, -3... or even fractions, decimals... (all real numbers)Variables. These are letters like d, a, s, e, t, k, a...Variables can have a number next to them; it's called a coefficient.Now that we know what this property states, let's simplify this expression.
5(x-2)
First, multiply 5 times x:
5x (5 is the coefficient of x, by the way)
Then, multiply 5 times -2 (please pay attention to the sign) :)
-10
Put both terms together.
Hence, the simplified expression is
\(\boxed{\boxed{\bold{5x-10}}}\)
Is it possible to simplify the expression any further? No.
Why? Because 5x and -10 aren't like terms, so we cannot combine them.
Hope everything is clear.
Let me know if you have any questions!
#ILoveLearning
:-)
REVIEW OF ESSENTIAL SKILLS AND PROBLEM SOL
Examining a savings plan for college
David wants to attend a college that will cost $21,000 for the first year. His uncle gave him a special gift of $12,000 to use toward the cost. David plans to
attend the college in 5 years. How much must David save each month to have enough for the first-year cost?
5
Based on the above, David must save $150 each month to cover the money left over for his first year of college.
How to calculate what David's savings should be for the next 5 years for his first year of university?To calculate the savings that David must make monthly for the next 5 years we must carry out the following procedure:
His uncle gave him $12,000 so we must subtract this value from the total he needs.
$21,000 - $12,000 = $9,000So he must save $9,000 in 5 years.
$9,000 / 5 = $1,800$1,800 / 12 = $150According to the above, he must save $1,800 per year, so each month he should save $150.
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In the diagram below, KM=5 and MN=3
Answer: KL = KN LM=NO=9 Side-Side-Side
Step-by-step explanation:
The required answers to the question is given below.
What is congruence?Triangle congruence: If all three corresponding sides and all three corresponding angles are equal in size, two triangles are said to be congruent. Slide, twist, flip, and turn these triangles to create a similar appearance. They are in alignment with one another when moved. "≅" is the congruence symbol.
How to solve it?Use the following figure to understand the answer.
The Proof is
1. KM=KO=5 (GIven)
2. MN=3 (Given)
3. KN=KM+MN=8 (because the lengths are equal to the sum of their parts.)
4. KL=8 (Given)
5. KL=KN (from 3,4 substitution)
6. NO=ML=9 (Given)
7. ΔKLM=ΔKNO the congruence criterion used is SSS congruence.
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Find the domain of the rational expression: 6-x/4x+20
The domain of the rational expression (6-x)/(4x+20) is all real numbers except x = -5.
To find the domain of a rational expression, we need to identify any values of x that would result in division by zero. Division by zero is undefined in mathematics
In this case, we need to set the denominator, 4x+20, equal to zero and solve for x:
4x + 20 = 0
Subtract 20 from both sides:
4x = -20
Divide both sides by 4:
x = -5
Therefore, the value x = -5 makes the denominator zero.
Now, we need to consider the values of x for which the denominator is not zero. Since the denominator is a linear expression (a polynomial of degree 1), it is defined for all real numbers except x = -5.
So, the domain of the rational expression (6-x)/(4x+20) is all real numbers except x = -5.
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16 families went on a trip which cost them Rs 2,16,352. How much did each
family pay?
Given that 16 families went on a trip and the cost of the trip was Rs. 2,16,352.The amount paid by each family is to be determined by unitary method Hence each family paid Rs.13522
Now, let's solve this by using the method of unitary method. To find the cost of 1 family trip, we will divide the total cost of the trip by the number of families.2,16,352 / 16 = 13,522 So, the cost of the trip per family is Rs. 13,522.Hence, each family paid Rs. 13,522 for the trip.
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Answer:
Step-by-step explanation
1. The total cost of the trip for all 16 families is Rs 2,16,352.
2. To find out how much each family paid, we need to divide the total cost by the number of families: Rs 2,16,352 ÷ 16.
3. When we do the division, we get the result: Rs 13,522.
Now let's check if this result is correct:
1. If each family paid Rs 13,522 for the trip, then the total cost for all 16 families would be: 16 × Rs 13,522 = Rs 2,16,352.
2. This is exactly the same as the total cost given in the problem statement.
So we have shown that each family paid **Rs 13,522** for the trip
20 POINTS!!!!! Find the corresponding point on the unit circle for the given radian measure.
0=7pi/6
Answer:
(-\(\frac{\sqrt{3}}{2}\),-\(\frac{1}{2}\))
Step-by-step explanation:
The corresponding point on the unit circle is ( -√3/2 , -1/2).
What is a unit circle?A unit circle is just a circle that has a radius of 1 unit. A unit circle can be used to define right triangle relationships known as sine, cosine and tangent. These relationships describe how angles and sides of a right triangle relate to one another.
For the given situation,
The radian measure is θ = 7pi/6
In unit circle, the radian θ = \(\frac{7\pi }{6}\) lies in the third quadrant and it's equal degree measure is \(210\)°.
The corresponding point for this radian measure is
( \(\frac{-\sqrt{3} }{2} ,\frac{-1}{2}\) )
Hence we can conclude that the corresponding point on the unit circle is ( -√3/2 , -1/2).
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Need help answering question 4 please
The answer is 140 because 14 x 10 is 140
Elena wants to make a scale drawing of her bedroom. In her drawing, the length of the bedroom is 10 cm and the width 6 cm. She decides on a scale of 1 to 50. What is the LENGTH of her actual bedroom
I NEED HELP NOW 70 POINTS IF YOU ANSWER RN
How do I solve for this?
Answer: \(cosx =- \sqrt{ 1 - sin^2x}\)
Step-by-step explanation:
Generally speaking; \(cos^2x + sin^2x = 1\)
rearranging this gives us all sorts of cool things.
for now, we will use: \(cosx = \sqrt{ 1 - sin^2x}\)
This however, is general.
In the third quadrant, cosine is negative. So cosx in QIII will be:
\(cosx =- \sqrt{ 1 - sin^2x}\)
and thats the answer :)
Kane's Furniture Store advertised a table at 9% discount. The original selling price was $109, and the sale price was $100. Was the sale price consistent with the ad? Explain.
Answer:
No, the sale price wasn't consistent with the ad
Step-by-step explanation:
The original selling price is 109. 9% of 109 is 9.81. So the sale price should be 99.19.
5(f + 4) = 4(f – 6)
Solve asap
Answer:
Hi there!!
Your answer is:
f= -44
Step-by-step explanation:
5(f+4) = 4(f-6)
5f +20 = 4f -24
-4f
f +20= -24
-20
f= -44
Chase had $236.00 in his savings account. Then he spent 34% or that money on a new skateboard. How much money did Chase spend on his skateboard
Answer:
$80.24
Step-by-step explanation:
Find the sum of the given integers. 7 + (-8) + 2 + (-1) =
Answer:
0
Step-by-step explanation:
7 + (-8) + 2 + (-1)
is the same as:
7 - 8 + 2 - 1
Simplify these:
-1 + 1
Solve:
0
what is this? 30 points!!!!
Answer: X = -351
Step-by-step explanation:
Answer:
x=117
Step-by-step explanation:
If the pre-image (4,-3) is translated <-6,-8> the image will be located at: (?,?)
Answer:
(-2, - 11)
Step-by-step explanation:
Coordinate of preimage = (4, - 3)
Pre image is translated <-6,-8>
X - coordinate of preimage = 4
Translation, x coordinate + (-6)
Y - coordinate of preimage = - 3
Translation, x coordinate + (-8)
Image will be located at (4+(-6) ; - 3+(-8))
Hence, we have (-2, - 11)
FACT or FIB?
-3-4-(-12)
-19
What Is Equivalent To The Following Equation?
\(4.033865e + 17\)
A high school is voting on a new mascot. Lion Eagle Bee Ninth Grade 45% 32% 23% Tenth Grade 36% 40% 24% Eleventh Grade 50% 28% 22% Twelfth Grade 40% 25% 35% Match the two-way table to the segmented bar graph.
The steps to create a bar graph are explained below.
To match the two-way table to the segmented bar graph, we need to create a segmented bar graph that represents the data in the table. The table shows the percentage of students in each grade who voted for each mascot option.
Here is how we can match the two-way table to the segmented bar graph:
For the Lion mascot option, the segmented bar graph would have the largest segment for 11th grade, followed by 9th grade, 10th grade, and 12th grade.For the Eagle mascot option, the segmented bar graph would have the largest segment for 10th grade, followed by 11th grade, 9th grade, and 12th grade.For the Bee mascot option, the segmented bar graph would have the largest segment for 12th grade, followed by 9th grade, 10th grade, and 11th grade.By creating a segmented bar graph that represents the data in the two-way table, we can visually compare the percentage of students who voted for each mascot option across different grade levels.
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what is question 4????
Answer:
2.2
Step-by-step explanation:
(1.85 x 2) - 1.50
...............
WILL GIVE BRIANLIEST just need the answers
Answer:
A. x+y<20
B.x+5y>40
C.(9)+5(9)=51 51>40
9+9=18 18<20
Step-by-step explanation:
Answer:
A. x+y<20
B.x+5y>40
C.(9)+5(9)=51 51>40
9+9=18 18<20
Step-by-step explanation:
Distance between two points khan academy
Answer:
√29
Step-by-step explanation:
This is due to A^2+b^2=c^2. you know that side a and b are 2 and 5, so it beocmes 25+4/=c^2, which means that 29=c^2, and you root it to get rid of the power of 2, so you obtain c=√29
A person is running at an initial velocity of 3.7 m/s. If the person is accelerating at 2 m/s2, what is their final velocity after 3 seconds?
Statement:
A person is running at an initial velocity of 3.7 m/s. If the person is accelerating at 2 m/s².
To find out:
The person's final velocity after 3 s.
Solution:
Initial velocity (u) = 3.7 m/sAcceleration (a) = 2 m/s²Time taken (t) = 3 sWe know, the equation of motion, v = u + atPutting the values in the above equation, we get,v = 3.7 m/s + 2 m/s² × 3 sor, v = 3.7 m/s + 6 m/sor, v = 9.7 m/sAnswer:
The final velocity is 9.7 m/s in the direction of the motion.
Hope you could understand.
If you have any query, feel free to ask.
For what values of a and b is x^64 + ax^b +25 a perfect square for all integer values of x?
For the expression \(x^64 + ax^b + 25\) to be a perfect square for all integer values of x, b must be 64, and a must be a perfect square, written as a = \(y^2.\)
To determine the values of a and b such that the expression\(x^64 + ax^b\) + 25 is a perfect square for all integer values of x, we need to analyze the properties of perfect squares.
A perfect square is an expression that can be written as the square of another expression. In this case, we want the given expression to be in the form of\((x^n)^2,\) where n is an even integer.
Let's examine the given expression: \(x^64 + ax^b\) + 25
For it to be a perfect square, the quadratic term \(ax^b\)must have the same exponent as the leading term\(x^6^4.\) This means b must be equal to 64.
So we have:\(x^64 + ax^64 + 25\)
Now, we can rewrite this as:\((x^32)^2 + 2(x^32) (\sqrt{a}) + (\sqrt{25})^2\)
By comparing this with the standard form of a perfect square, (\(x^n +\sqrt{k} )^2\), we can deduce that √a must be equal to x^32 and \(\sqrt{25}\) must be equal to \(\sqrt{k.}\)
Therefore, we have: \(\sqrt{a} = x^3^2\)and\(\sqrt{25} = \sqrt{k}\)
From the second equation, we know that k = 25.
Now, substituting the value of k back into the first equation, we have: \(\sqrt{a} = x^3^2\)
To satisfy this equation for all integer values of x, a must be a perfect square. Therefore, we can express a as a =\(y^2\), where y is an integer.
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