Answer:
2000
Step-by-step explanation:
40 x 50 = 2000
Today, everything at a store is on sale. The store offers a 20% discount.
A - If the regular price of an item is x dollars, what is the discount price in dollars?
B- The discount price of a hat is $18. What is the regular price?
I need the answer fast plz!!!!!!!!!!!!!!!
Answer:
A=14.4 dollars
B= x = regular price x discount then subtract the regular price with the discount
C=21.6 dollars
Step-by-step explanation:
A linear regression model describing the relationship between the carat weight and price of very high quality diamonds is summarized below.
r= 0.9693
y = 20312x - 5939
A diamond seller lists a very high quality diamond weighing 0.8 carats at a price of $9,999. Does this model over- or under-predict the price of this diamond?
a. The model over-predicts the price of this diamond because the residual is positive.
b. The model under-predicts the price of this diamond because the residual is positive.
c. The model over-predicts the price of this diamond because the residual is negative.
d. The model under predicts the price of this diamond because the residual is negative.
e. We do not have enough information to answer this question.
Answer:
The correct option is c.
Step-by-step explanation:
The regression line representing the price of very high quality diamonds is:
[tex]y = 20312\cdot x - 5939[/tex]
It is provided that a diamond seller lists a very high quality diamond weighing 0.8 carats at a price of $9,999.
Compute the predicted price of the diamond weighing 0.8 carats as follows:
[tex]\hat y = 20312\cdot x - 5939[/tex]
[tex]=( 20312\times 0.8) - 5939\\\\=10310.60[/tex]
The predicted price of the diamond weighing 0.8 carats is $10,310.60.
In regression, the difference amid the observed-value of the dependent-variable (y) and the predicted-value ([tex]\hat y[/tex]) is known as the residual (e).
Compute the residual value as follows:
[tex]e=y-\hat y[/tex]
[tex]=9999-10310.60\\\\=-311.60[/tex]
The residual value is -$311.60.
Thus, it can be concluded that the model over-predicts the price of this diamond because the residual is negative.
The correct option is c.
The Cat on the Piano A standard piano keyboard has 88 different keys. Find the probability that a cat, jumping on 4 keys in sequence and at random (possibly with repetition), will strike the first four notes of Beethoven's Fifth Symphony. (Leave your answer as a formula.)
Answer:
The piano has 88 keys, so there are 88 keys that can be pressed by the cat.
We can assume that each one of the 88 keys has the same probability of being pressed.
We want to find the probabiiity that the cat press the first four notes of the Fifth Symphony (i suppose we want to find the probability where the cat strikes the notes in the correct order), those notes are:
These notes, at least in the melody, are 3 LA´s, and one REb.
While in a piano the notes are repeated a lot of times, (in 88 keys we will have around 7 of each).
All of them have a different pitch (some are higher notes, and other are lower).
The ones in the beginning of the Fifth Symphony are already defined, this means that for each note, we have a probability of 1/88 of hitting the correct key.
Then the cat needs to do this four times.
The first LA will have a probability of 1/88 of being hit.
The second LA will have a probability of 1/88 of being hit.
The third LA will have a probability of 1/88 of being hit.
The REb will have a probability of 1/88 of being hit.
Then the joint probability will be the product of each individual probability, this means that the probability of the cat hitting those four notes in order is:
P = (1/88)*(1/88)*(1/88)*(1/88) = 1.7*10^(-8)
The probability that a cat, jumping on 4 keys in sequence and at random, will strike the first four notes of Beethoven's Fifth Symphony is [tex]\rm 1.7\times 10^{-8}[/tex].
Given :
The Cat on the Piano A standard piano keyboard has 88 different keys.
The following steps can be used in order to determine the probability that a cat, jumping on 4 keys in sequence and at random, will strike the first four notes of Beethoven's Fifth Symphony:
Step 1 - The four notes of the piano are 3 LA's and 1 REb.
Step 2 - The probability that the first key is LA is 1/88.
Step 3 - The probability that the second key is LA is 1/88.
Step 4 - The probability that the third key is LA is 1/88.
Step 5 - The probability that the key is REb is 1/88.
Step 6 - So, the probability that a cat, jumping on 4 keys in sequence and at random, will strike the first four notes of Beethoven's Fifth Symphony is:
[tex]\rm P=\dfrac{1}{88}\times \dfrac{1}{88}\times \dfrac{1}{88}\times \dfrac{1}{88}[/tex]
[tex]\rm P = 1.7\times 10^{-8}[/tex]
For more information, refer to the link given below:
https://brainly.com/question/21586810
A company has two manufacturing plants with daily production levels of 5x+14 items and 3x−7 items, respectively. The first plant produces how many more items daily than the second plant? please help again
Answer:
3x+24 more widgets
Step-by-step explanation:
A company owns two manufacturing plants:
1st plant: 8x+17 widgets;2nd plant: 5x-7 widgets.
To find how many more items the first plant produces daily than the second plant, we have to subtract from the number of widgets the first plant produces the second plant produces. So,
(8x+17)-(5x-7)\\ \\=8x+17-5x+7\ [\text{Eliminate brackets}]\\ \\=(8x-5x)+(17+7)\ [\text{Combine the like terms}]\\ \\=3x+24
hope this helps!
Step-by-step explanation:
is the following term a polynomial? How can you tell? (2 pts)
4x3+2x2+4x+5−1+16
Answer: hold on
Step-by-step explanation:
What is the length of AC?
Answer:
add all divide by 3
Step-by-step explanation:
Parallel and Perpendicular Lines
Refer to the figure for Exercises
1 and 2.
12
314
817
65
1. Which pair of angles are corresponding angles?
A Z1 and 22 C 21 and 24
B 21 and 23 D 21 and 26
o
Help me find rate change between 2 and 17
Answer:
1/6
Step-by-step explanation:
find the slope would be change in y /change in x so y2-y1/x2-x1
4-2/24/12=2/12=1/6
Write the logarithm as a sum or difference of logarithms. Simplify each term as much as possible. Assume that the variables represent positive real numbers.
log3(1/9a^3b^2)
Answer: Ln( (1/9)*a^3*b^2) = 3*Ln(a) + 2*Ln(b) - Ln(9)
Step-by-step explanation:
Here we need to use the relations:
Ln(x^y) = y*Ln(x)
Ln(x*y) = Ln(x) + Ln(y)
Ln(x/y) = Ln(x) - Ln(y)
Then, we have:
Ln( (1/9)*a^3*b^2)
First we could use the second relation to rewrite this as:
Ln(1/9) + Ln(a^3) + Ln(b^2)
Now we can use the third relationship to rewrite the first term as:
ln(1/9) = ln(1) - ln(9) = -ln(9)
Then our equation becomes:
Ln(1/9) + Ln(a^3) + Ln(b^2) = Ln(a^3) + Ln(b^2) - ln(9)
Now we can use the first relation to rewrite this as:
Ln(a^3) + Ln(b^2) - ln(9) = 3*Ln(a) + 2*Ln(b) - Ln(9)
And that is all the simplifications we can do.
If math were a weather, what type of weather would it be and why?
Answer: a thunderstorm
Step-by-step explanation:
B/c there is more than one way to do math but if you don’t do it a specific way at a certain time then it becomes a problem.
people meeeeeeeeeee
The Extreme Rock Climbing Club planned a climbing expedition. The total cost was $2600, which was to be divided equally among the members going. Prior to the trip, 10 members decided not to go. If the cost per person increased by $130, how many people went on the expedition?
Answer:
20 because 130 * 20 = 2600
Step-by-step explanation:
Random website...
Please with this plzzzz plz I’ll mark u
Answer:
1. D
2a. A line with a slope of 0 is a horizontal line.
2b. A line with an undefined slope is a vertical line.
Step-by-step explanation:
Answer:
D is the answer
Step-by-step explanation:
I have done
11 < 5h - 4 help pleasessssssssssss
Answer:
X > 3
EDIT*
H > 3
Apologies, I've forgotten to change the subtitude.
Step-by-step explanation:
-Solve the inequality
Hope it helps! :)
A toy car costing $50 is on sale for 10% off. What is the sale price of the car? *
Your answer this should be easy
Answer:
$45.00
Step-by-step explanation:
A method to prove statements using properties that justify each step.
Answer:
A two column proof is a method to prove statements using properties that justify each step. The properties are called reasons.
Step-by-step explanation:
hope dis helps!
Is (3,-3) a solution of the graphed system of inequalities ?
HELP PLEASE ILL MARK BRANLIEST
Use the DESMOS graphing calculator to find the solution to the system.
1
y = -3x + 2
y = 2x - 3
Show work please
Answer:
Can you be more specific of what you are looking for please? i just entered it into the calc but what are you looking for as the answer?
Rally Co.'s fixed costs to produce toy trucks are $200,000. The variable costs to produce each truck are $4. They will price the trucks at $20.
What is their total sales (revenue) when they break-even?
Answer:
Their total sales (revenue) when they break-even is $250,000
Step-by-step explanation:
Linear Modeling
Some situations can be mathematically represented as linear functions. If we are in a situation where a linear model is suitable, then we need two independent data to build it up.
The linear function can be expressed in the slope-intercept format:
y = mx + b
Where m and b are constant values.
The total cost function for Rally Co.'s to produce x toy trucks is:
C(x) = 200,000 + 4x
Given they sell each truck for $20, the revenue function is:
R(x)= 20x
The break-even condition is when the costs and the revenue are equal:
20x = 200,000 + 4x
Subtracting 4x:
16x = 200,000
Dividing by 16:
x = 200,000/16
x = 12,500 toy trucks
The revenue at this production level is:
R(x)= 20*12,500=250,000
Their total sales (revenue) when they break-even is $250,000
Evaluate the expression if a = 4, b = 9, and c = 1.
3b÷c1−a
–27
–9
9
27
Answer:
Given - a = 4
b = 9
c = 1
To find - Value of equation
Solution -
3b ÷ c^1 - a
Putting the value of a,b and c in the equation
3(9) ÷ (1)^1 - 4
27 ÷ 1 - 4
27 ÷ (-3)
27 × (1 /(-3)
27/(-3)
(-9)
Answer:
-9
Step-by-step explanation:
Substitute the values into the expression.
= 3(9)÷(1)1-4
evaluate/simplify each part first.
= 27÷1-4
= 27÷(-3)
simplify (positive divided by a negative is a negative)
= -9
find the surface area of the following objects
PLS HELP ILL PICK U BRAINLEIST I JUST NEED HELP
24+24+24+24+24+24= 144 m
If you deposit $2,300 at 2.71% interest, compounded continuously, what would your ending balance be to the nearest cent after 4 years
33. The students of Class VIII of a school donated Rs 2401 in all, for Prime Minister's National
Relief Fund. Each student donated as many rupees as the number of students in the class. Find
the number of students in the class.
Ry
Answer:
49
Step-by-step explanation:
Let there be x students in the class.
Since, donation by each student is equal to the number of students in the class.
So,
Total donations = 2401
[tex]x \times x = 2401 \\ \\ {x}^{2} = 2401 \\ \\ x = \pm \sqrt{2401} \\ \\ \pm \: 49 \\ \\ \because \: x \: can \: not \: be \: - ve. \\ \\ \therefore \: x = 49[/tex]
Thus, the number of students in the class = 49
s) Find 2 rational numbers between these two fractions
1413/5689
1838/7370
Take the average, which always lies in the middle of any two numbers:
(1413/5689 + 1838/7370) / 2 = 5217548/20963965
To get another number, take the average of this number with any of the first two. For example,
(1413/5689 + 5217548/20963965)/2 = 10424453/41927930
Notice that
1413/5689 ≈ 0.248374
10424453/41927930 ≈ 0.248628 … … … (the second average, between the first number and the first average)
5217548/20963965 ≈ 0.248882 … … … (the first average of the given two numbers)
1838/7370 ≈ 0.249389
(underlined for emphasis)
Does anyone know the whole answers to Lesson 2: Semester A Exam, please!! 50 POINTS
Answer:
What school do you go to and maybe I can help?
Step-by-step explanation:
Determine the most possible complex zeros of the following function:
f(x) = 3x4 - 7x +3
Answer:
In my screenshot
Step-by-step explanation:
Answer: 4
Step-by-step explanation:
descartes rule of signs to test maximum positive and negative:
3x4 - 7x + 3
two sign changes, so maximum of 2 positive real zeroes
3x4 + 7x + 3
no sign changes, so maximum of 0 negative real zeroes
this means that we can have 2 or 0 real zeroes.
if we have 0 real zeroes, we will have 4 imaginary.
therefore the most possible number of complex roots is 4
Jacob was researching the number of hours the average adult sleeps each night. He collected data from five individuals:
Subject Hours of Sleep
Subject 1 6
Subject 2 6.5
Subject 3 6
Subject 4 7.5
Subject 5 5
Using the data above, what is the standard error of the sample mean?
a) 0.15.b) 0.74.c) 6.10.d) 0.41.
Answer:
0.41
Step-by-step explanation:
Given the data:
Subject Hours of Sleep
Subject 1 6
Subject 2 6.5
Subject 3 6
Subject 4 7.5
Subject 5 5
The standard error of the sample mean :(S. E) is given by standard deviation / square root of sample size.
To calculate the standard deviation :
Using the formula :
Sample size = n = 5
Sqrt(Σ(X - mean)^2 / n - 1)
This can be obtained faster using a calculator :
Hence, using calculator the standard deviation of the sample is 0.90829
Hence,
Standard Error = 0.90829 / sqrt(5)
Standard Error = 0.90829 / 2.2360679
Standard Error = 0.4061996
Evaluate (3−1)3+7(6)−5²
Emily predicted her car payment to be $250 each month. Her actual car payment is
$275 each month. By what is the percent error in Emily’s prediction?
Answer:
10%
Step-by-step explanation:
(y-x)/x*100
275-250/250*100
25/250*100 which is 10
10%.
Hope this helps!
write a number with a 7 in it that is 10 times larger than the number below
45971
Answer:
459710
Step-by-step explanation:
When 45971 is multiplied by 10, it becomes 459710.
This number has a 7 in it as well, so 459710 is the answer.
#teamtrees #WAP (Water And Plant)
Answer:
459710
Step-by-step explanation:
Since it’s 10 times larger becuase 45971*10 is 459170 and it contains the digit 7 in it, and it didn’’t say we couldn’t repeat then its possible to use this!
