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
makvit [3.9K]
3 years ago
6

The perimeter of a rectangle is 68 cm. The length is 4 cm more than its

Mathematics
2 answers:
Lisa [10]3 years ago
6 0

Answer:

21

Step-by-step explanation:

68 divided by 4 sides is 17 subtract 4 cm for width and add 4 cm for length to get 21 cm for length and 13 cm for width

nadya68 [22]3 years ago
4 0

Answer:

17

Step-by-step explanation:

You might be interested in
Determine the sample size needed to construct a 90% confidence interval to estimate the population proportion when p = 0.65 and
WINSTONCH [101]

Answer:

n=170

Step-by-step explanation:

1) Notation and definitions

n random sample taken (variable of interest)

\hat p=0.65 estimated proportion.

p true population

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by \alpha=1-0.90=0.1 and \alpha/2 =0.05. And the critical value would be given by:

z_{\alpha/2}=\pm 1.64

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.06 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.65(1-0.65)}{(\frac{0.06}{1.64})^2}=169.968  

And rounded up we have that n=170

6 0
3 years ago
Help me asap :) Giving Brainliest and rate!!
liraira [26]
The answer is 51. This is because if you 15 is added then you multiply by the 10
7 0
2 years ago
Read 2 more answers
I need some help on the math problem as soon as possible
givi [52]

Answer:

A(1,6)

Step-by-step explanation:

SOOO, we're gonna graph it okay?

I graphed it, and A was the only one on the line.

I hope this helps

7 0
3 years ago
Solve the following equation: *<br> -9 (t – 2) = 4(t – 15)
iragen [17]

Answer:

6 =t

Step-by-step explanation:

-9 (t – 2) = 4(t – 15)

Distribute

-9t +18 = 4t -60

Add 9t to each side

-9t +18+9t  = 4t+9t -60

18 = 13t -60

Add 60 to each side

18+60 = 13t-60+60

78 = 13t

Divide each side by 13

78/13 = 13t/13

6 =t

5 0
3 years ago
Help please help me out please ​
maxonik [38]

Answer:

-\frac{28}{3}

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Other questions:
  • Witch one is greater 500 inches or 40 feet
    15·2 answers
  • Solve each of the following equations for xx.<br> 2^x+1 = 32
    12·2 answers
  • 4<br> — = 16<br> M<br><br> Omg help me this is due tomorrow!!!
    8·1 answer
  • Please help me with this please
    13·2 answers
  • The angle of elevation of the top of a tower from two points 121 m and 144 m away from the foot of the tower on th same side are
    15·1 answer
  • Background info: Two friends are trying to decide how long their ladder should be for the zip line they are building. There are
    15·1 answer
  • What is the slope of the line that passes through (3,5) (7,3)<br> A<br> -2<br> B) -1/2<br> 2<br> 1/2
    12·2 answers
  • Can anyone help on this?? It’s due tomorrow!!
    8·1 answer
  • The figure below is divided into 100 squares of equal size.
    9·2 answers
  • you hope to borrow $450,000 at 7% interest per annum compounded quarterly. You will repay the loan in one payment at the end of
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!