Question Progress
boel
21/40 Marks
Find the area of this parallelogram.
13 cm
15 cm
20 cm
Answers
Related Questions
Fechner's law in experimental psychology was first hypothesized in the 1860s. It describes the relationship between a change in sensory stimulus and the perceived change in the stimulus. Examples include • adding one tsp of sugar to a cup of tea (stimulus change) and sensing how much sweeter the tea tastes (perception change) • increasing the weight of an object you're holding (stimulus change) and sensing how much heavier the object feels (perception change) Let's look at this second situation. Let s be the weight of an object in grams, and let P(s) be the perceived weight of the object to someone holding it. Fechner's law says for some constant k > 0, k dP ds (a) Translate the differential equation to a sentence by filling in the blanks: The rate of change of with respect to a change in to the is Words you might use are time, weight, perceived weight, proportional, inversely proportional, equal. (b) Check that P(s) = k ln(s) + C is a solution to Fechner's law for any constant C. (c) Suppose that 0.5 grams is the threshhold stimulus, the highest actual weight at which a person cannot perceive any weight. In other words, holding 0.5 grams feels like holding zero weight. Find the particular solution to Fechner's law given this initial value. (d) What does your solution from part (b) predict for the perceived weight of an object of weight 0.25 grams should be? Does this make sense? If so, explain why, and if not, suggest a way to improve the model. (e) Does Fechner's law predict that it is easier to tell the difference between objects weighing 5 and 10 grams or between objects weighing 100 and 105 grams? Explain your answer in 1-2 sentences, referring to the differential equation.
Answers
a. To determine if the two populations of crawfish from Devon and Cornwall have the same mean carapace length, we can use the two-sample t-test.
This test compares the means of two independent samples to assess whether they are significantly different.
We can calculate the sample means and sample standard deviations for both groups:
Next, we calculate the t-value using the formula:
To determine if this t-value is statistically significant, we need to compare it to the critical value from the t-distribution for the given degrees of freedom
If the calculated t-value falls outside the critical region, we can reject the null hypothesis and conclude that the two populations have different mean carapace lengths. Otherwise, we fail to reject the null hypothesis and conclude that there is not enough evidence to suggest a significant difference in the mean carapace length between the two populations.
b. To answer the question using the Wilcoxon rank sum test, we need to combine the observations from both samples, assign ranks based on their relative positions, and calculate the sum of ranks for one of the samples (either Devon or Cornwall). The null hypothesis for this test is that the two distributions are the same.
To know more about Wilcoxon's rank:- brainly.com/question/29772048
#SPJ11
Find the indicated margin of error. In a survey of 1485 adults from one town, 744 said they had tried some form of alternative medicine. Find the margin of error for the 97% confidence interval used to estimate the population proportion. Round your answer to three decimal places.
Answers
The margin of error for the 97% confidence interval is approximately 0.021
The margin of error for the 97% confidence interval used to estimate the population proportion can be calculated using the formula: margin of error = z * √((p * (1 - p)) / n), where z is the z-score corresponding to the desired confidence level, p is the sample proportion, and n is the sample size.
To calculate the margin of error, we need to determine the sample proportion, which is the ratio of the number of adults who said they had tried alternative medicine to the total sample size: p = 744/1485 = 0.5017.
The z-score for a 97% confidence level is approximately 1.8808 (obtained from the standard normal distribution table).
Plugging in the values:
margin of error = 1.8808 * √((0.5017 * (1 - 0.5017)) / 1485) ≈ 0.021
Therefore, the margin of error for the 97% confidence interval is approximately 0.021, rounded to three decimal places.
You can learn more about confidence interval at
https://brainly.com/question/15712887
#SPJ11
I don’t know what to put as the answer for this question
Answers
Answer:
Molecules
Step-by-step explanation:
I hope this helps!
number 5 please help me
Answers
Answer:
I think C or D
Step-by-step explanation:
It is important to understand that integral equations also arise from problems in differential equations. (a) For example, write the initial value problem dx = f(t, x), x(to) = xo dt as an integral equation and indicate what kind of equation it is. (b) Show that an initial value problem d²x dt² = f(t, x), x(to) = xo, x'(to) = x₁ involving a second order differential equation can be transformed into a Volterra integral equation
Answers
The Volterra integral equation:
x(t) - xo = ∫[to, t] y(s) ds
y(t) - x₁ = ∫[to, t] f(s, x(s)) ds
(a) To write the initial value problem dx = f(t, x), x(to) = xo dt as an integral equation, we can use the integral representation of the solution.
Let's consider the integral equation:
x(t) = xo + ∫[to, t] f(s, x(s)) ds
This integral equation is of the Volterra type, as it involves a definite integral and depends on the function x(s) evaluated over the interval [to, t].
(b) To transform the second-order initial value problem d²x/dt² = f(t, x), x(to) = xo, x'(to) = x₁ into a Volterra integral equation, we can introduce a new variable, y(t), defined as the derivative of x(t):
y(t) = dx/dt
Now, we can rewrite the second-order differential equation as a system of first-order differential equations:
dx/dt = y(t)
dy/dt = f(t, x)
To represent this system as an integral equation, we'll integrate both equations from to to t.
This yields:
x(t) - xo = ∫[to, t] y(s) ds
y(t) - x₁ = ∫[to, t] f(s, x(s)) ds
Combining these two equations, we obtain the Volterra integral equation:
x(t) - xo = ∫[to, t] y(s) ds
y(t) - x₁ = ∫[to, t] f(s, x(s)) ds
This integral equation is also of the Volterra type, involving definite integrals and depending on the functions x(s) and y(s) evaluated over the interval [to, t].
Learn more about Volterra integral equation click;
https://brainly.com/question/32259957
#SPJ1
The measures of two complementary angles are in the ratio of 2 : 7. Find the measurements of the two angles.
Answers
Answer: 20° & 70°
Step-by-step explanation:
We know complementary angles will add up to 90° and we also know we can divide the total by 9 parts because our ratio is 2 parts to every 7 parts.
To find each individual part size...
9x=90
x=10
so use our ratio...
2x10=20 for first angle
7x10=70 for second angle
25
119 degrees
13
Find the value of
X. Round to the
nearest 10th.
Answers
Answer:
30.5
Step-by-step explanation:
The data from a survey of ages of people taking an exercise class was skewed to the left
Answers
Answer:
It is really hard to see the picture
Step-by-step explanation:
Could you also give the choices to the answers that are possible? It would help out a lot. Just lmk in the comments and then I will revise my answer :)
Answer:
Part A: The appropriate measure of center to describe the distribution of the data would be, median.
Part B: The appropriate measure of spread to describe the distribution of data would be, interquartile range.
Part C: The box plot represents the data. Calculate the appropriate measure of spread, IQR = 13
Got it right on math nation. Hope this helps!
gloria went to the mall and spent 50 minutes shopping
Answers
Answer:
11:00 AM+ 50 minutes= 11:50
11:50 AM+30 minutes= 12:20
Step-by-step explanation:
Gloria went to the mall and spent 50 minutes shopping. Then she had lunch for 30 minutes. If Gloria arrived at the mall at 11:00 A.M., at what time did she finish lunch?
The linear graph shows the possible combinations of cakes and pies a club must sell to meet their fundraising goal. What is the domain of the graph? A) {x: 0 < x < 40} B) {x: 0 ≤ x ≤ 40} C) {x: 0 < x < 20} D) {x: 0 ≤ x ≤ 20}
Answers
Answer:
[tex]\{x: 0 \le x \le 40 \}[/tex]
Step-by-step explanation:
Given
See attachment for graph
Required
The domain of the graph
To do this, we simply write out the range of value of the x-coordinate.
From the attached graph, the x values are:
[tex]x = [0,40][/tex] i.e. from 0 to 40 (both inclusive)
So, the domain is:
[tex]\{x: 0 \le x \le 40 \}[/tex]
You school plans to collect at least 1500 pairs of socks for the homeless shelter. So far they have collected 183 pairs of socks. There are 4 days left of the sock drive. Write an inequality and solve to represent the average number of pairs of socks to be collected each of the last 4 days.
Answers
Answer: the amount of socks they will collect in four days is less than the amount of socks they plant to collect, in other words 915<1500 socks.
Step-by-step explanation:
If they collect 183 pairs of socks in one day, and there are four days left, then 183 x 5 = 915 (pairs of socks) in five days. They need to collect 1,500 pairs.
how to remove Dec in casio calculator?
0
Answers
Answer:
htgjyk
Step-by-step explanation:
Please simplify the question
Answers
Answer: 11
Explanation: You did everything right in terms of the steps you took. It looks like you accidentally wrote "1" instead of "-4" as the answer to "2(-2)".
Please answer correctly! I will mark you Brainliest!
Answers
20-10=10
10-3=7
7cm
Then the volume is 7cm
Step-by-step explanation:
volume of cuboid=lbh =10*3*20 =600cm3What is the height of the models sail in centimeters?
Answers
Step-by-step explanation:
the the height should be 16 cm I used the Pythagoras theory thank you.
1. Determine the truth values for each of the following statements. (a) The sum of 4 and 6 is prime if and only if either 4 or 6 is prime. (b) If 3 divides 20, then 6 divides 20.
Answers
(a) The statement "The sum of 4 and 6 is prime if and only if either 4 or 6 is prime" is false.
(b) The statement "If 3 divides 20, then 6 divides 20" is true.
(a) The sum of 4 and 6 is prime if and only if either 4 or 6 is prime.
To determine the truth value of this statement, we need to evaluate both directions separately.
Direction 1: If the sum of 4 and 6 is prime, then either 4 or 6 is prime.
This direction is true because the sum of 4 and 6 is 10, which is not a prime number. Therefore, the statement is true.
Direction 2: If either 4 or 6 is prime, then the sum of 4 and 6 is prime.
This direction is false because neither 4 nor 6 is a prime number, but their sum is 10, which is not a prime number. Therefore, the statement is false.
Since the statement is not true in both directions, the overall statement is false.
(b) If 3 divides 20, then 6 divides 20.
To determine the truth value of this statement, we need to evaluate the implication.
If 3 divides 20, then 6 divides 20.
This statement is true because 3 divides 20 (3 is a factor of 20), and 6 also divides 20 (6 is a factor of 20). Therefore, the statement is true.
Learn more about "prime ":
https://brainly.com/question/145452
#SPJ11
Find the measure of the indicated angle to the nearest degree.
Answers
Answer:
37 degrees
Step-by-step explanation:
Cos x = 48/60
Cos x = 0.8
x = cos^-1 0.8
x = 36.8699
A function g(x) is strictly increasing if g'(x) > 0 on its domain. Assume the supply and demand functions for a high-tech product are Qs = S(P), QD = D(P+T,Y), where Y is the income, T is the consumption tax on the product, and P is the price. We don't specify a particular analytical form of the supply and demand functions, but we assume that both functions are well defined on their domains and their derivatives exist. We also assume that S'(P) > 0 on its domain, and that 37¹ D(Z,Y) < 0, and By Dr. =D(Z,Y) > 0, əz ƏY where Z = P + T. Assume an equilibrium state exists in the sense that the supply and demand are balanced: S(P) – D(P+T, Y) = 0. (1) Assume P is a function of Y. Is price (P) an increasing or decreasing function of income (Y)? Show your working steps to support your answer. (2) Assume P is a function of T. Is price (P) an increasing or decreasing function of tax (T)?
Answers
(1) Price (P) is an increasing function of income (Y) based on the assumption that S'(P) > 0, 37¹ D(Z,Y) < 0, and By Dr. = D(Z,Y) > 0. (2) Price (P) is an indeterminate function of tax (T) based on the given information.
(1) To determine the relationship between price (P) and income (Y), we need to analyze the sign of dP/dY, the derivative of price with respect to income. From the assumptions given, S'(P) > 0 implies that the supply function is strictly increasing with respect to price. Additionally, 37¹ D(Z,Y) < 0 implies that the demand function is strictly decreasing with respect to price. By Dr. = D(Z,Y) > 0 indicates that the demand function is strictly increasing with respect to Y. Therefore, when we differentiate equation (1) with respect to Y, we get S'(P) - D'(Z,Y) * (dZ/dY) = 0. Since S'(P) > 0 and D'(Z,Y) < 0, the sign of (dP/dY) depends on the sign of (dZ/dY). However, the information given does not specify the relationship between Z and Y, so we cannot determine the exact relationship between P and Y.
(2) Similarly, to determine the relationship between price (P) and tax (T), we need to analyze the sign of dP/dT, the derivative of price with respect to tax. Unfortunately, the information provided does not include any direct assumptions or relationships regarding the derivatives of the supply and demand functions with respect to tax. Therefore, based on the given information, we cannot determine the relationship between price (P) and tax (T).
Learn more about derivatives here: https://brainly.com/question/25324584
#SPJ11
(-4 5/8) - (-1 1/4) =
Answers
Answer:
the answer is -3.375 hope this helped
Help me plsssssssss I need help
Answers
Answer:
432 each.
Step-by-step explanation:
You make 20% .2%
Amy,Corey, and John go to Central Park to throw a flying disk among themselves. they stand at the positions as shown on the coordinate grid below...PLEASE HELP QUICK! I WILL GIVE BRAILY ANSWER THING PLEASEEE
Answers
Answer:
B
Step-by-step explanation:
It is what it is
A restaurant used 231 eggs last week. 46 of them are colored white, w. The remaining eggs are colored brown. Write an equation that represents the situation. ( i will give you brainly)
Answers
Answer:
46 + W = 231
Step-by-step explanation:
Answer:
My guess: 231 = 46 + b
Step-by-step explanation: Because they didn't mention how many were colored brown, we would use a variable to represent them, in this case I use b. But we do know 46 of them were white. so the equation would simply be 231 = 46 + b. After you add 46 and b you will get the total to 231. You can find b from subtracting 231 to 46. Then add b to 46 and get the total of 231
Use the triangle shown to answer the questions that follow.
15 m
X
32
a) Using the 32° as the reference angle, label the hypotenuse (h), adjacent (a) and opposite (0).
b) Which trig function (cos, sin, or tan) could be used to solve for x?
c) Solve for x.
Answers
Answer/Step-by-step explanation:
a. Given that 32° is the reference angle, thus:
Hypotenuse is the side opposite to the right angle
Opposite side is opposite to the defence angle = x
Adjacent side is adjacent to defence angle = 15 m
b. Recall SOHCAHTOA.
We know the length of the adjacent side. We are asked to find x, which is the opposite side. So, we are dealing with Opposite side and Adjacent side.
The trigonometric function we will use to find x would be TOA:
That is,
Tan θ = Opp/Adj
c. Applying TOA:
Tan θ = Opp/Adj
θ = 32°
Opp = x
Adj = 15 m
Plug in the values
Tan 32 = x/15
15 × Tan 32 = x
9.37304028 = x
x = 9.4 (nearest tenth)
is 5 meters bigger or 1,300 centameters
Answers
Answer:
1,300 centameters
Answer: 1,300 centimeter meters is bigger
Step-by-step explanation:
Suppose 15% of the population are 62 or over, 27% of those 62 or over have loans, and 54% of those under 62 have loans. Find the probabilities that a person fits into the following categories. (a) 62 or over and has a loan (b) Has a loan (c) Are the events that a person is 62 or over and that the person has a loan independent?
Answers
A. P(62 or over and has a loan)= 4.05%
B. P(has a loan)=48.6%
C. P(62 or over and has a loan)=0.486
15% of the population are 62 or over
27% of those 62 or over have loans
54% of those under 62 have loans
To find the probabilities that a person fits into the following categories:
a) 62 or over and has a loan:
P(62 or over) = 15% = 0.15
P(62 or over and has a loan) = P(62 or over) * P(have a loan|62 or over)
= 0.15 * 0.27
= 0.0405 or 4.05%
b) Has a loan:
P(has a loan) = P(62 or over) * P(have a loan|62 or over) + P(under 62) * P(have a loan|under 62)
= 0.15 * 0.27 + 0.85 * 0.54
= 0.486 or 48.6%
c) P(62 or over and has a loan) = P(62 or over) * P(have a loan|62 or over)
= 0.15 * 0.27
= 0.0405 or 4.05%
P(62 or over) = 0.15 and P(have a loan) = 0.486
So, P(62 or over and has a loan) ≠ P(62 or over) * P(have a loan)
Hence, the events that a person is 62 or over and that the person has a loan are not independent.
To learn more about probabilities, refer below:
https://brainly.com/question/29381779
#SPJ11
consider the following function and express the relationship between a small change in x and the corresponding change in y in the from dy = f^1 (x) dx.
f(x) = 2x^3-4x
dy= dx
Answers
For a small change in x (dx), the corresponding change in y (dy) is given by the equation dy = (6x² - 4)dx.
To find the relationship between a small change in x (dx) and the corresponding change in y (dy) for the function f(x) = 2x³ - 4x, we can differentiate the function with respect to x.
f(x) = 2x³ - 4x
Differentiating both sides with respect to x:
f'(x) = d/dx (2x³ - 4x)
f'(x) = 6x² - 4
Now, we can express the relationship between dx and dy in the form of dy = f'(x)dx:
dy = (6x² - 4)dx
Therefore, for a small change in x (dx), the corresponding change in y (dy) is given by the equation dy = (6x² - 4)dx.
Learn more about Derivative here
https://brainly.com/question/31308059
#SPJ4
(-1 1/4 divided by (-0.2)
Answers
Answer:
6.25
Step-by-step explanation:
ayo help me please!!
Answers
Answer:
D?
Step-by-step explanation:
Im not exactly sure
Answer:
i believe the answer you're looking for is A/ 15
Step-by-step explanation:
hi there!
so its been a quick minutes since i have done a stem and left plot but the question is asking how many quarters had less then 20 points scored
here is a stem and leaf plot that i had made to make it easier for me to explain this problem it you!
_stem__|__leaf_____________________________________
0 | 0, 2, 3, 7, 7, 8, 9
1 | 0, 1, 4, 4, 4, 7, 7, 7
2 | 0, 1, 7, 8, 9
3 |
4 | 2, 3, 6, 8
as you can see, i bolded each number that was less then the number 20, if we counted how many of the numbers that were bold in that stem and leaf plot the number would be 15!
sorry this was such a short answer! but i do hope i helped you with this :)
The median of 8 numbers is 4.5.Given that seven of the numbers are 9,2,3,4,12,13,1 find the eighth number
Answers
Answer:
5
Step-by-step explanation:
Answer: 5
Step-by-step explanation:
We rerange the number in 1,2,3,4,9,12,13
The median is 4, and a number x between 4 and 9.
We have 4.5 for median, which is the average of 4 and x.
(4 + x) /2 = 4.5
4 + x = 9
x = 5
In ΔCDE, the measure of ∠E=90°, DE = 84 feet, and EC = 13 feet. Find the measure of ∠C to the nearest tenth of a degree.
Answers
Answer: 81.2
Step-by-step explanation: