Answers
Answer:
C = 2*π*r
Step-by-step explanation:
When given the radius, we can multiply it by both pi and 2 to find the circumference of a circle.
Answer:
C=2πr
Step-by-step explanation:
C=2πr
Related Questions
In an insect colony, there are 270 insects after 7 days. If there were initially 80 insects, how long will it take the population to grow to 700 insects?
Answers
Step-by-step explanation:
Total insects = 270
Days = 7
If 80 insects to 700 insects
Days = 700 ÷ 80 = 8.75
It will take 8.75 days
Nick's science class is observing the growth rate of a tomato plant. The tomato plant grows 3 cm every week for 12 weeks. What is the total growth of the tomato plant during these 12 weeks?
Answers
Answer:
36 cm
Step-by-step explanation:
Because the plant is growing the same amount each week you would take 12(3) and get 36 cm at the end of the 12 weeks.
A 2011 Gallup survey based on telephone and face-to-face interviews with 4,220 adults in China, aged 15 and older suggests that 30% smoke regularly or occasionally. The following is also noted "one can say with 95% confidence that the maximum margin of sampling error is 2.2 percentage points". Which of the following is true based on the results of this survey?
A. If we were to randomly sample another group of 4,220 Chinese adults we would find that exactly 30% of them smoke as well.
B. If the sample size was larger, the margin of error would be larger as well.
C. Exactly 30% of all Chinese adults smoke.
D. We are 95% confident that 25.6% to 34.4% of all Chinese adults smoke.
E. We are 95% confident that 27.8% to 32.2% of all Chinese adults smoke.
Answers
Answer:
E. We are 95% confident that 27.8% to 32.2% of all Chinese adults smoke.
Step-by-step explanation:
x% confidence interval between a and b.
Interpretation: We are x% sure that the true value is between a and b.
In this question:
95% confidence level
30% with a margin of error of 2.2%.
So
30 - 2.2 = 27.8%
30 + 2.2 = 32.2%
So the correct answer is:
E. We are 95% confident that 27.8% to 32.2% of all Chinese adults smoke.
PLEASE HELP
Find the length of BC
Answers
Answer:
BC or n=72
Step-by-step explanation:
ABC≈DEF
[tex]\frac{AB}{DE} =\frac{BC}{EF}=\frac{AC}{DF}=k[/tex]
[tex]\frac{54}{9} =\frac{n}{12}[/tex]
[tex]9n=54*12[/tex]
[tex]9n=648[/tex] (then divide both sides by 9.)
[tex]n=72[/tex]
Math problem please help
Answers
Answer:
volume = 64 in³area = 96 in²Step-by-step explanation:
Put the given number into the formulas and do the arithmetic:
Volume = s³ = (4 in)³ = 64 in³
Area = 6s² = 6(4 in)² = 96 in²
Isaiah receives $10 per week for his allowance. let m be the total amount
of money Isaiah gets and let w be the number of weeks he receives his
allowance. Which variable is the dependent variable?
A: W; number of weeks
B: M; total amount of money
Answers
B: M; total amount of money
Step-by-step explanation:
because the time is a independent variable
Answer:
b id the answer
Step-by-step explanation:
becasue i just finished my test
David has a garden with dimension 11 feet long x 9 feet wide. he wants to enlarge the garden to an area of 126. How much farther will he need to extend the length of the garden to attain his desired
Answers
Width = 9
Area we need = 126
So Area = length * width
126 = 11 * 9
Now.. this is obviously wrong.. they want us to find the correct length..
126 = L * 9
126/9 = L
L = 14
Now since they ask about how much farther you need to extend, take the final and subtract from the original
14 - 11 = 3
Answer is 3.
Evelyn bought stock in a company two years ago that was worth xx dollars. During the first year that she owned the stock, it decreased by 36%. During the second year the value of the stock decreased by 20%. Write an expression in terms of xx that represents the value of the stock after the two years have passed.
Answers
Answer:
0.512xx
Step-by-step explanation:
100% - 36% = 64%
64% = 0.64
thus after 1st yr, she is left with the value of 0.64xx
100% - 20% = 80%
80% = 0.8
thus after 2nd yr, she is left with the value of 0.8 x (0.64xx) = 0.512xx
Please help for the 3rd time and not the last time either (:
Answers
A piece of equipment costs $50,000 new, but depreciates 15% per year in each succeeding year.
Find its value after 10 years.
Answers
Answer:
-$25,000
Step-by-step explanation:
15% of $50,000 is $7,500 Therefore..
10 x $7,500 = $75,000 ( 10 being the amount of years and 7500 being the 15% )
$50,000 - $75,000 = -$25,000
Hope this helps!!
-Conrad
If p represents “a number is divisible by 2,” q represents “a number is odd,” and r represents “a number is even,” what does this statement imply?
WILL MARK BRAINLIEST!!!!
Answers
Answer:
B
Step-by-step explanation:
idk y but still ur teacher can't do anything
1. What does this quote mean to you?
2. How can you apply it to your life?
"You exist only in what you do." ~ Federico Fellini
***Must answer with a pharagraph, minimum 5 sentences, just give me your opinion.
Answers
Answer:
My opinion is that you can exist any many things as you navigate through life. This quote is very wrong because you can exist in doing things for other people and not just yourself! You can not be selfish your entire life! I think that you should be for other people! I think that doing stuff for yourself is okay to a certain extent!
Step-by-step explanation:
THIS IS SOOO WRONG( idk tho)
This quote is telling us that you can't exist unless you are doing something worth being remembered for. Through out our lives we all listen to what the world tells us, but not many of us actually do what we want to. We live our lives for someone else, but I plan to change that. Instead of letting the public decide how I should live my life I will live for me. I will work harder in school, become smarter than my parents and grow as a person. I want to be remembered for stepping out of my comfort zone and being different. This is the year that I exist, and show people that I exist for a purpose.
Step-by-step explanation:
Went really deep with this one.
Estimate the difference to the nearest 10th 0.612-0.185
Answers
Answer:
0.4
Step-by-step explanation:
Round 0.600 - 0.200 = 0.4
Find two consecutive odd integers such that the sum of their squares is 202.
Answers
Answer:
9 and 11
Step-by-step explanation:
The squareroot of 202 is 14... so the numbers are both less than 14.
9*9= 81
11*11= 121
121+81= 202
Answer:
9 and 11
Step-by-step explanation:
(9^2) + (11^2) Simplify the exponents
81 + 121 = 202
Stephen and Shane are twins. They came up with a math puzzle . Stéphen says he is (5x + 4) years old, and Shane says he is (10x - 3) years old. What is the value of ? What are their ages?
Answers
rewrite the equation as y-2=-2/3(x-(-1)) to identify a point on the graph
Answers
Answer:
point (-1, 2)
Step-by-step explanation:
Your equation is shown here in point-slope form, so a point on the graph can be read from the given equation. (No further rewrite is necesary.)
The point-slope form is ...
y -k = m(x -h)
Comparing this to your given equation ...
y -2 = (-2/3)(x -(-1))
we see that ...
k = 2, m = -2/3, h = -1
The point on the graph is (h, k) = (-1, 2).
Answer:
point (-1,2)
Step-by-step explanation:
what is the distance between -45 and -98 on a number line
Answers
Answer:
53
Step-by-step explanation:
If a is 3 and c is 12, then 4ac equals
Answers
Answer:
144
Step-by-step explanation:
4ac=
4(3)(12)=
144
Hope this helps!
Explanation:
4*a = 3 * c = 12
4*3*12 = 12* 12
= 144
Which is the equation of a hyperbola centered at the origin with x-intercept +\- 3 and asymptote y=2x
Answers
Answer:
[tex]{\dfrac{x^{2}}{9} - \dfrac{y^{2}}{36} = 1}[/tex]
Step-by-step explanation:
The hyperbola has x-intercepts, so it has a horizontal transverse axis.
The standard form of the equation of a hyperbola with a horizontal transverse axis is [tex]\dfrac{(x - h)^{2}}{a^{2}} - \dfrac{(y - k)^{2}}{b^{2}} = 1[/tex]
The center is at (h,k).
The distance between the vertices is 2a.
The equations of the asymptotes are[tex]y = k \pm \dfrac{b}{a}(x - h)[/tex]
1. Calculate h and k. The hyperbola is symmetric about the origin, so
h = 0 and k = 0
2. For 'a': 2a = x₂ - x₁ = 3 - (-3) = 3 + 3 = 6
a = 6/2 = 3
3. For 'b': The equation for the asymptote with the positive slope is
[tex]y = k + \dfrac{b}{a}(x - h) = \dfrac{b}{a}x[/tex]
Thus, asymptote has the slope of
[tex]\begin{array}{rcl}m& =& \dfrac{b}{a}\\\\2& =& \dfrac{b}{3}\\\\b& =& \mathbf{6}\end{array}[/tex]
4. The equation of the hyperbola is
[tex]\large \boxed{\mathbf{\dfrac{x^{2}}{9} - \dfrac{y^{2}}{36} = 1}}[/tex]
The attachment below represents your hyperbola with x-intercepts at ±3 and asymptotes with slope ±2.
Answer: c
Step-by-step explanation: edge 23
An online retailer has determined that the average time for credit card transactions to be electronically approved is 1.8 seconds. (Round your answers to three decimal places.) (a) Use an exponential density function to find the probability that a customer waits less than a second for credit card approval. (b) Find the probability that a customer waits more than 3 seconds. (c) What is the minimum approval time for the slowest 5% of transactions
Answers
Answer:
a) 0.426 = 42.6% probability that a customer waits less than a second for credit card approval.
b) 0.189 = 18.9% probability that a customer waits more than 3 seconds.
c) The minimum approval time for the slowest 5% of transactions is 5.39 seconds.
Step-by-step explanation:
Exponential distribution:
The exponential probability distribution, with mean m, is described by the following equation:
[tex]f(x) = \mu e^{-\mu x}[/tex]
In which [tex]\mu = \frac{1}{m}[/tex] is the decay parameter.
The probability that x is lower or equal to a is given by:
[tex]P(X \leq x) = \int\limits^a_0 {f(x)} \, dx[/tex]
Which has the following solution:
[tex]P(X \leq x) = 1 - e^{-\mu x}[/tex]
The probability of finding a value higher than x is:
[tex]P(X > x) = 1 - P(X \leq x) = 1 - (1 - e^{-\mu x}) = e^{-\mu x}[/tex]
An online retailer has determined that the average time for credit card transactions to be electronically approved is 1.8 seconds.
This means that [tex]m = 1.8, \mu = \frac{1}{1.8} = 0.5555[/tex]
(a) Use an exponential density function to find the probability that a customer waits less than a second for credit card approval.
This is [tex]P(X \leq 1)[/tex].
[tex]P(X \leq 1) = 1 - e^{-0.5555*1} = 0.426[/tex]
0.426 = 42.6% probability that a customer waits less than a second for credit card approval.
(b) Find the probability that a customer waits more than 3 seconds.
This is P(X > 3).
[tex]P(X > x) = 1 - P(X \leq 3) = 1 - (1 - e^{-0.5555*3}) = 0.189[/tex]
0.189 = 18.9% probability that a customer waits more than 3 seconds.
(c) What is the minimum approval time for the slowest 5% of transactions
This is x for which [tex]P(X \leq x) = 0.95[/tex]
So
[tex]P(X \leq x) = 1 - e^{-\mu x}[/tex]
[tex]0.95 = 1 - e^{-0.5555x}[/tex]
[tex]e^{-0.5555x} = 0.05[/tex]
[tex]\ln{e^{-0.5555x}} = \ln{0.05}[/tex]
[tex]-0.5555x = \ln{0.05}[/tex]
[tex]x = -\frac{\ln{0.05}}{0.5555}[/tex]
[tex]x = 5.39[/tex]
The minimum approval time for the slowest 5% of transactions is 5.39 seconds.
The diameter of a flour tortilla is 12 inches. What is the area to the nearest hundredth?
area: about in 2
Answers
Answer:
18.85
Step-by-step explanation:
The area of a circle is A= pi × r² (r being the radius)
The radius is half the diamter so the radius would be 6
Plug 6 into the equation for the radius
A = pi × 6²
A = pi ×36
A= 18.85
how to find the scale factor of triangles
Answers
Answer:
you pick similar sides from both the triangles and try and divide or find common multiples. for ex if the sides are 3 and 9, you can find that the scale factor is 3 since 9/3 is 3
Step-by-step explanation:
Identify the design of the following study. A researcher classifies students according to three parental income groups and also according to three possible score ranges on the SAT examination. He randomly selects two students from each of the nine (Income, SAT) combinations. The researcher records the grade point averages (GPA) of those sample members at the end of the sophomore year.
a. Randomized block design
b. Two-Factor ANOVA with replication
c. One-way ANOVA
Answers
Answer:
140000000
Step-by-step explanation:
PLEASE HELP!!!!
Which choices are equivalent to the expression below? Check all that apply.
5^2 • 5^9
Answers
Answer:
D & E
The ones you chose are correct.
A theater group is having a carwash fundraiser. The group can only wash 45 cars with the amount of soap they purchased. Each car is charged $7. The function f(c) = 7c represents the amount of profit they make per car. Which inequality represents its domain?
Answers
Answer:
The domain for this function is [tex]c > 0[/tex] where [tex]c \in Z[/tex].Step-by-step explanation:
The given function is
[tex]f(c)=7c[/tex]
Where [tex]c[/tex] represents cars. This function models the profits they make.
Now, as you can deduct already, we can define to different domains, the mathematical one and the reasonable one.
The reasonable domain is about all the useful values to the problem. For example, as we are talking about car, they can't wash -5 cars, so negative numbers are excluded. Similarly, they can't wash 6.75 cars, because that would imply an incomplete job.
Therefore, the domain for this function is [tex]c > 0[/tex] where [tex]c \in Z[/tex].
(Notice that we specify that the independent valur can only use whole positive numbers only).
Please answer this correctly
Answers
Answer:
x =1
Step-by-step explanation:
Assuming the figures are similar, we can use ratios to solve
x 2
---- = -----
4 8
Using cross products
8x = 2*4
8x = 8
Divide by 8
8x/8 = 8/8
x=1
A debate team consists of five girls and four boys. (Everyone is distinguishable.) How many ways can they stand in line, so that at least two of the girls are standing next to each other?
Answers
Answer:
9!-2880 = 360000.
Step-by-step explanation:
Find the equation for the line that passes through the point
(−5,0)
, and that is parallel to the line with the equation
y=−
3
4
x−
21
4
y=−34x−214
.
Answers
Answer:
y = -3/4x -15/4
Step-by-step explanation:
We assume you mean the given line to be ...
y = -3/4x -21/4
The slope of this line is -3/4. The parallel line will have the same slope.
__
In point-slope form the equation of the line you seek is ...
y -k = m(x -h) . . . . . . line with slope m through point (h, k)
y = -3/4(x -(-5)) . . . . .substitute m=-3/4 and (h, k) = (-5, 0)
y = -3/4x -15/4
Kim plays a card game with the children. She gives Gareth a card.
Gareth has to guess whether his card is higher or lower than 5 Kim tells him
• there are 10 cards higher than 5
• there are 4 cards lower than 5
Gareth thinks he should guess higher than 5
b) Is Gareth correct?
Explain why you think this.
Answers
Answer:
Yes
Step-by-step explanation:
There are total 10+4 = 14 cards
P(higher than 5) = 10/14 = 5/7
P(lower than 5) = 4/14 = 2/7
There's a higher chance of the card being greater than 5
Step-by-step explanation:
Step 1: Determine if Gareth is correct
Total number of cards → 10 + 4 → 14
Probability of choosing lower → 4/14 → 2/7
Probability of choosing higher → 10/14 → 5/7
Since 5/7 > 2/7, that means that Gareth is correct be choosing a higher card.
Answer: Yes
What is the value of the following expression when p = 9? 6p+5
Answers
Find the value of the expression when p equals 9.
So to solve the expression: 6p + 5
We have to plug in the 9 for p
6p + 5 = ?
6(9) + 5 = ?
Then, we multiply solve.
6 x 9 = 54
54 + 5 = 59
Thus, the final value of the expression is 59.
The value of the expression when p is equal to 9 is 59.
Given that,
Expression; [tex]\rm 6p+5[/tex]
We have to determine,
The value of p when p is equal to 9?
According to the question,
Expression; [tex]\rm 6p+5[/tex]
To determine the value of p the calculation must be done in following steps following all the steps given below.
Step1; Substitute the value of p in the expression,[tex]= 6p+5\\\\= 6 \times 9 + 5\\[/tex]
Step2; Solving the expression,[tex]= 6 \times 9 + 5\\\\= 54 +5\\\\=59[/tex]
Hence, The required value of the expression when p is equal to 9 is 59.
For more details refer to the link given below.
https://brainly.com/question/18334317