1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Keith_Richards [23]
3 years ago
10

Alguem sabe a resposta? 3 (x+y) -3(2+8) x (x-y) 2xy(x+y)?

Mathematics
1 answer:
algol133 years ago
6 0
3 (x+y)=3x+<span>3<span>y || -3(2+8)=-30 || x(x-y)=x2−<span>x<span>y || 2xy(x+y)?=<span><span><span><span>2<span>x^2</span></span>y</span>+<span><span>2x</span><span>y^2</span></span></span></span></span></span></span></span>

You might be interested in
Add (6x^2-3x)+(5x-7)
iragen [17]

No problem.

The answer is 31x.

Hope this helped

7 0
3 years ago
Read 2 more answers
3 divided by 1 quarter
Amiraneli [1.4K]
3 divided by 1 quarter is equal to 12 because 
3 divided 1/4 is 12 . 1/4 is a quarter. so this is how you get your answer.    3 divide 1/4 = 3/1 multiply 4/1=12/1 =12
7 0
3 years ago
Determine whether the given linear equations are parallel, perpendicular, or neither.
ladessa [460]

Answer:

A. Perpendicular

Step-by-step explanation:

Lines are perpendicular if their slopes are opposite reciprocals of each other. Opposite, meaning if positive, the other slope is negative, and if negative, the other slope is positive. Reciprocal meaning, the number is flipped upside down, turning fractions into whole numbers and vice versa.

1/9  

-1/9

-9

The slopes are perpendicular

4 0
2 years ago
Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its guidelines for how small com
Rasek [7]

Answer:

a) The 95% confidence interval for the mean summer weight (including carry-on luggage) of Frontier Airlines passengers is between 179 and 187 pounds. This means that we are 95% sure that the mean summer weight of all Frontier Airlines passengers is between these two values.

b)

The 95% confidence interval for the mean winter weight (including carry-on luggage) of Frontier Airlines passengers is between 185.4 pounds and 194.6 pounds. This means that we are 95% sure that the mean winter weight of all Frontier Airlines passengers is between these two values.

c) They are respected, as the upper bound of both intervals is below the new FAA recommendations.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve these questions.

Question a:

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 100 - 1 = 99

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 99 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 1.9842

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.9842\frac{20}{\sqrt{100}} = 4

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 183 - 4 = 179 pounds.

The upper end of the interval is the sample mean added to M. So it is 183 + 4 = 187 pounds.

The 95% confidence interval for the mean summer weight (including carry-on luggage) of Frontier Airlines passengers is between 179 and 187 pounds. This means that we are 95% sure that the mean summer weight of all Frontier Airlines passengers is between these two values.

Question b:

Critical value is the same(same sample size and confidence level).

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 1.9842\frac{23}{\sqrt{100}} = 4.6

The lower end of the interval is the sample mean subtracted by M. So it is 190 - 4.6 = 185.4 pounds.

The upper end of the interval is the sample mean added to M. So it is 190 + 4.6 = 194.6 pounds.

The 95% confidence interval for the mean winter weight (including carry-on luggage) of Frontier Airlines passengers is between 185.4 pounds and 194.6 pounds. This means that we are 95% sure that the mean winter weight of all Frontier Airlines passengers is between these two values.

c. The new FAA recommendations are 190 pounds for summer and 195 pounds for winter. Comment on these recommendations in light of the confidence interval estimates from Parts (a) and (b).

They are respected, as the upper bound of both intervals is below the new FAA recommendations.

7 0
3 years ago
Why you do not have to do any computing or math do solve 15 x 0 x (13 + 7)? Explain.
kozerog [31]

Answer:

because when you do 15*0 it =0 so anything else multiplied by 0 is 0

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • The length of a rectangle is 3 time the width. the perimeter is 65.6 cm. find the width.
    8·2 answers
  • Write the equation of the​ line, with the given​ properties, in​ slope-intercept form.
    15·2 answers
  • Similar Triangles, really need help on this one tried to do it but I don't understand it please help.
    9·1 answer
  • Write an expression for the missing value in
    6·2 answers
  • A guy wire makes a 67° angle with the ground. Walking out 32 feet further from the tower, the angle of elevation to the top of t
    5·1 answer
  • The graph of the function f(x)= 2x is shown. The inverse is also a function. If the domain of the inverse is the range values of
    15·2 answers
  • What is the circumference of this circle
    9·2 answers
  • Y = 2x - 15 y = 5x solve using systems of equations
    13·2 answers
  • Evaluate the function: f (x)=4x-1. Find f (5)
    14·2 answers
  • Mmm your all wrong it 8:00 I just took it and its said it 8:00
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!