Answer:
[tex]4 {x}^{2} [/tex]Step-by-step explanation:
As,
[tex] {(ax)}^{2} = a \times a \times x \times x[/tex]
Hence,
[tex] {(2x)}^{2} [/tex]
= 2×2×x×x
[tex] = 4 {x}^{2} (ans)(without \: brackets)[/tex]
The standard deviation of SAT scores for students at a particular Ivy League college is 250 points. Two statistics students, Raina and Luke, want to estimate the average SAT score of students at this college as part of a class project. They want their margin of error to be no more than 26 points.
(a) Raina wants to use a 90% condence interval. How large a sample should she collect?
(b) Luke wants to use a 99% condence interval. Without calculating the actual sample size, determine whether his sample should be larger or smaller than Raina's, and explain your reasoning.
(1) smaller since Luke has a higher level of confidence in his results than Raina
(2) smaller because higher degrees of confidence require smaller margins of error
(3) larger higher degrees of confidence require larger margins of error
(c) Calculate the minimum required sample size for Luke.
Answer:
A
Step-by-step explanation:
Pleaaase helpppp I will give u a brainly
Bob makes three different silverware - spoons, forks and knives. Each unit (dozen) of spoon gives him a profit of $9, forks of $20 and knives of $17.50. He has 183 hours of machine time, 250 hours of labor and 185 pounds of steel. It takes him 4 hours of machine time, 4 hours of labor time and 3 pounds of steels to make one unit of spoons. Each unit of forks take 4 hours of machine time, 9 hours of labor time and 2 pounds of steel, while knives take 5 hours of machine time, 5 hours of labor and 4 pounds of steel. It is also found that he should make at least 16 units of forks in the process. The solution is
x1 = ________
x2 = ________
x3 = ________
with an objective value of ________
The resources that are used up are________
If it was decided that as many as 20 units of forks could be made instead of 16, how much would profit increase?
Answer:
Solution is:
z (max) = 687.5
x₁ = 0
x₂ = 16
x₃ = 21
Step-by-step explanation:
From the problem statement we have:
Resources: machine time ( 183 h) labor (250 h) steel 185 (pounds)
Unit
Spoons 4 4 3
forks 4 9 2
knives5 5 5 4
Profit $ 9 20 17.5
Objective function z = 9*x₁ + 20*x₂ + 17.5 *x₃ to maximize
Subject to:
Availability of machine time : 183 h
4*x₁ + 4*x₂ + 5*x₃ ≤ 183
Availability of labor : 250 h
4*x₁ + 9*x₂ + 5*x₃ ≤ 250
Availability of steel : 185 pounds
3*x₁ + 2*x₂ + 4*x₃ ≤ 185
Requirement:
x₂ ≥ 16
General constraints:
x₁ ≥ 0 x₃ ≥ 0 all integers
After 6 iteration the solution using AtomZmath on-line solver
z (max) = 687.5
x₁ = 0
x₂ = 16
x₃ = 21
Resources used:
Machine time: 16* 4 + 21*5 = 64 + 105 = 169
remains 183 - 169 = 14 h
Labor: 16*9 + 21* 5 = 144 + 105 = 249
remains 250 - 249 = 1 h
Steel : 16*2 + 21*4 = 32 + 84 = 116
remains 185 - 116 = 69 pounds.
If it is decided that 20 units of forks are to be made then
we will need 4*4 = 16 h of machine time
9*4 = 36 h of labor
2*4 = 8 pounds of steel
We can get that from abandom to make one unit of x₃ ??
No because as we said we need 36 hours of labor ( we still have 1 we need 35 more hours ) if we make 20 x₃ insted of 21 we get only 5 hours.
z we got is maximum
Please help with this question so I'm going to fail math
Answer:
108: 4x3^3, 3^2x12, 6^2x3
96: 2^5x3, 2^3x122^4x6
Step-by-step explanation:
Help!!!!!!!!!!!!!!!!!!!!!
Which measurement could be a surface area measure?
24 km2
18 m3
63 oz.
12 mm
(3m^0)^3
A. 27cm3
B. 27
what is the probability of choosing a jack of hearts or an ace from a deck of cards? type your answer as a fraction
Answer:
5/52.
Step-by-step explanation:
Prob(Jack of hearts) = 1/52 - as there is only 1 jack hearts in pack.
Prob(Ace drawn) = 4/52 as there are 4 aces.
The price of an 18-minute phone call is 1.60$. What is the price of an 18-minute phone call?
3. The ratio of blue marbles to white marbles in Simran’s bag is equal to
1 to 2. If there are 20 blue marbles,
how many white marbles are there?
A 20 C 40
B 30 D 50
Answer:
its 40
Step-by-step explanation:
1x20 = 20
and 2x20=40
Answer:
C) 40
Step-by-step explanation:
Ratio of blue to white marbles: 1:2 = 20:40
Nick's science test has a section with twelve true-or-false questions. In how many different ways can Nick answer the questions?
Answer:
you can do 2^12=4096
there are 4096 different ways nick can answer the question
Voters in a community are considering a bond issue for a new school. The building plan and the projected increase in property taxes have been presented at several public meetings. With voting day just a few weeks away, Tasha is interested in determining whether the population of about 5,000 voters supports the bond issue. Describe in two to three sentences the best way for Tasha to sample the population so that she can conduct a survey.
Answer:
do you go gca too
Step-by-step explanation:
The best way to sample the population so that she can conduct a survey is to conduct a random sampling
How to determine the best way?From the question, we have the population to be:
Population = 5000
In order to conduct a survey, Tasha must carry out a random sampling by using the following steps
Set a small size of interval (say 5)Ask every other 5 (or the chosen size) people present at the meeting about the vote preference.The above is called a random sampling technique
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Answer:
A
Step-by-step explanation:
Answer:
Don't agree with 1 and 2, agree with 3
Step-by-step explanation:
1: -35 degrees Fahrenheit is colder than 35 degrees Fahrenheit.
2: A distance of 15 meters is greater than a distance of 10 meters, not less, so it is not closer to sea level.
3: A distance of 17 meters is less than a distance of 40 meters, so it is closer to sea level.
John is asked to roll a fair number cube, numbered from one to six, and toss a balanced quarter simultaneously. What is the probability that he will roll a 2 and the quarter will come up tails?
Answer: 1/12 or 8.3%
Step-by-step explanation:
probability of a 2 on the cube: 1/6
probability of tails on the quarter: 1/2
1/6*1/2=1/12
1/12 or 8.33333% (round to 8.3%)
In the image, two circles are centered at A. The circle containing was dilated to produce the circle containing B!
What is the scale factor of the
dilation?
O A. 1
OB. 2
OC. 0.5
OD.
-0.5
Y=5(x+4)(x-3)
PLEASE HELP ASAP
Answer:
-4, 3
Step-by-step explanation:
To find x intercepts, set y equal to 0;
0 = 5(x+4)(x-3); when x = -4 or x = 3, y will be zero (these are the x intercepts),
The table shows the number of words a
person types for different amounts of
time. What is the rate of words typed per
minute?
Minutes
3 5 9
Words Typed 105 175 315
A 29 words per minute
B 35 words per minute
C 70 words per minute
Drag the tiles to the correct boxes to complete the pairs.
Match the trigonometric functions that have the same value.
sin (pi/11)
sin (7pi/11)
sin (5pi/11)
sin (8pi/11)
Answer: in photo
Step-by-step explanation:
Photo
All the songs all the figures except a _____ have to bases
Answer:
Square pyramid
Step-by-step explanation:
100 students are interviewed to see which of biology, chemistry or physics they prefer.
39 of the students are girls. 21 of the girls like biology best.
16 of the boys prefer physics.
11 out of the 34 who prefer chemistry are girls.
What percentage of the students prefer biology?
Answer:
43% of the students prefer biology
Step-by-step explanation:
Among girls:
39 of the students are girls.
21 of the girls like biology best.
Boys:
100 - 39 = 61 are boys.
16 prefer physics
11 out of the 34 who prefer chemistry are girls, so 34 - 11 = 23 are boys.
61 - (16 + 23) = 22 prefer biology.
What percentage of the students prefer biology?
21 boys and 22 boys, that is, 43 students out of 100. So
43*100%/100 = 43%
43% of the students prefer biology
HELPP can someone give me the answer to this questions?
Answer:
Step-by-step explanation:
(21+13/74-18x3)x10=17
rad3/ 2=0.86
ad 281^r2-160^2=231
2^10-2^9=512
ultima= 4
Convert the function from factored form to standard form by multiplying:
Answer:
x² + 3x - 10
Step-by-step explanation:
( x + 5 ) ( x - 2 )
→ Expand
x² + 5x - 2x - 10
→ Simplify
x² + 3x - 10
URGENT Give the hourly wage equivalent to $20,800 a year
Answer:
$10.67
Step-by-step explanation:
If you made 20,800 a year, your hourly wage would be $10.67
Answer:
The hourly wage is $56.98
Step-by-step explanation:
20,800/365 equals 56.98
A rectangle has a length of (3x - 4) units and a width of (2x + 3) units,
What is the perimeter of the rectangle in terms of ?
A. (5x - 2) units
B. (5x + 14) units
C. (10x - 2) units
D. (10x + 14) units
Answer:
C. (10x - 2) units
Step-by-step explanation:
Perimeter of a rectangle:
The perimeter of a rectangle of length l and width w is given by:
[tex]P = 2(l + w)[/tex]
A rectangle has a length of (3x - 4) units and a width of (2x + 3) units.
This means that [tex]l = 3x - 4, w = 2x + 3[/tex]
What is the perimeter of the rectangle in terms of x?
[tex]P = 2(l + w) = 2(3x - 4 + 2x + 3) = 2(5x - 1) = 10x - 2[/tex]
The correct answer is given by option C.
Solve for x.
188 – 12
16x + 8
x =
= [?]
Enter
No links will report
Answer:
10
Step-by-step explanation:
Angles 8x - 12 and 6x + 8 are adjacent angles.
Adjacent angles are equal.
8x - 12 = 6x + 8
8x - 6x = 8 + 12
2x = 20
x = 20 / 2
x = 10
Answer:
8x-12=6x+8
[corresponding angle]
8x-6x=12+8.
x=20/2
x=10
Which represents the area of this rectangle?
Answer:
I think is b
Step-by-step explanation:
sorry if it is not right
1. The amount of time Mr. Smith spends exercising each day is
approximately normally distributed with a mean of 30 minutes and a
standard deviation of 10 minutes. On approximately what percent of the
days in a year does Mr. Smith exercise for between 10 minutes and 40
minutes?
Answer:boy
Step-by-step explanation:boy
Mr. Smith exercises for between 10 and 40 minutes on 77.45 percent of the days in a year.
Given that his exercising time follows a normal distribution with a mean of 30 minutes and a standard deviation of 10 minutes.
Here we have to find the percentage of days in a year that Mr. Smith exercises for between 10 and 40 minutes,
First, we need to standardize the values of 10 and 40 minutes using the formula,
⇒ z = (x - μ) / σ
where x is the value we want to standardize,
μ is the mean,
And σ is the standard deviation.
For x = 10:
⇒ z = (10 - 30) / 10
= -2
For x = 40:
⇒ z = (40 - 30) / 10
= 1
Now, we need to find the probability of Mr. Smith exercising between -2 and 1 standard deviations from the mean.
We can use a standard normal distribution table or a calculator to find this probability.
Using a standard normal distribution table,
we can find the probability of z being between -2 and 1 is about 0.7745. This means that on approximately 77.45% of the days in a year, Mr. Smith exercises for between 10 and 40 minutes.
Therefore,
Mr. Smith exercises for between 10 and 40 minutes on approximately 77.45% of the days in a year.
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Find the measure of arc BEF.
Given:
The diagram of a circle.
[tex]m\angle BPV=124^\circ ,m\angle VPE=30^\circ ,m\angle EPF=76^\circ, m\angle FPD=48^\circ[/tex].
To find:
The measure of arc BEF.
Solution:
The measure of central angle is equal to the measure of corresponding arc.
So, in the given figure,
[tex]n(arcBV)=124^\circ ,m(arcVE)=30^\circ ,m(arcEF)=76^\circ, m(arcFD)=48^\circ[/tex]
Now,
[tex]m(arcBEF)=m(arcBV)+m(arcVE)+m(arcEF)[/tex]
[tex]m(arcBEF)=124^\circ +30^\circ+76^\circ[/tex]
[tex]m(arcBEF)=230^\circ[/tex]
Therefore, the measure of arc BEF is 230 degrees.
please help me .
Select the correct answer.
Which expression is equivalent to the given expression?
2.12 – 111 – 6
A. (2x + 3)(3-2)
B. 2(x + 3)(x - 2)
C. (2 + 1) (1 - 6)
D. 2(1 – 3)(x + 1)
Answer:
(2x + 3)(x - 2)
Step-by-step explanation:
use FOIL
First, Outside, Inside, Last
2x x x = 2x²
2x x -2 = -4x
3 x x = 3x
3 x -2 = -6
2x² - 4x + 3x - 6
The antisymmetric exchange interaction of two electron spins σ1 and σ2 is given by Hamiltonian operator H = A · (σ1 × σ2),Furthermore, the direct product of two single spin subspaces is meant, so that the resulting Hilbert space of spins is a 4x4 matrix. Is the square of the total spin of two electrons conserved?
Answer:
Yes the square of the total spin of two electrons is conserved ( s^2)
Step-by-step explanation:
using the Hamiltonian operator H = A · (σ1 × σ2)
S = ( S1 + S2 )
S^2 = S²₁ + S²₂ + 2S₂ . S₂ ( apply the equation of time evolution )
Attached below is the detailed solution