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
damaskus [11]
3 years ago
10

I need help please and thank you

Mathematics
2 answers:
andrew-mc [135]3 years ago
3 0

Answer:

Area will be 2(lb + bh + hl)

So 2*(12*9 + 9*4 + 4*12)

384 sqft

Talja [164]3 years ago
3 0

Step-by-step explanation:

Here , length (l) = 12 ft

width (w) = 9ft

height(h) = 4ft

Surface area = 2( lw +wh+ lh)

= 2( 12×9 +9×4+4×12)

=2(108+36+48)

= 2×192 = 384 sq. ft

You might be interested in
a rectangular room is twice as long as its breadth and its peimeter is 540 m. find the number of bricks of size 20 cm ×12cm to p
balu736 [363]

Answer:

Step-by-step explanation:

breadth = x

length = 2x

Perimeter = 540m

2*( length + breadth ) = 540

2 *(2x + x) = 540

3x = 540/2

3x = 270

x = 270/3

x = 90 m

Breadth = 90m = 90 *100 = 9000 cm

Length = 2*90 = 180 m = 180 * 100 = 18000 cm

No.of bricks = Area of room/ area of one brick

= 9000 * 18000 / 20 * 12

= 675000 bricks

6 0
3 years ago
Here are summary statistics for randomly selected weights of newborn​ girls: nequals=174174​, x overbarxequals=30.930.9 ​hg, seq
MaRussiya [10]

Answer:

The 95% confidence interval would be given by (29.780;32.020)  

Step-by-step explanation:

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".

\bar X=30.9 represent the sample mean for the sample  

\mu population mean (variable of interest)

s=7.5 represent the sample standard deviation

n=174 represent the sample size  

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=174-1=173

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-T.INV(0.025,173)".And we see that t_{\alpha/2}=1.97, this value is similar to the obtained with the normal standard distribution since the sample size is large to approximate the t distribution with the normal distribution.  

Now we have everything in order to replace into formula (1):

30.9-1.97\frac{7.5}{\sqrt{174}}=29.780    

30.9+1.97\frac{7.5}{\sqrt{174}}=32.020

So on this case the 95% confidence interval would be given by (29.780;32.020)    

The value 29.6 is not contained on the interval calculated.

5 0
3 years ago
What is the factored form of x^2-x-2
lisov135 [29]

Answer:

(x-2),(x+1)

Step-by-step explanation:

5 0
2 years ago
What are the first four terms in the sequence Tn=4n+9?
marysya [2.9K]

Answer: If the initial term of an arithmetic sequence is a 1 and the common difference of successive members is d, then the nth term of the sequence is given by: a n = a 1 + (n - 1)d The sum of the first n terms S n of an arithmetic sequence is calculated by the following formula: S n = n (a 1 + a n)/2 = n [2a 1 + (n - 1)d]/2

6 0
2 years ago
HELP! E
mestny [16]

Answer:

c

Step-by-step explanation:

Multiplying 49 by 1/7 in the inverse operation of dividing it by 7, so they will both get the correct answer.

6 0
3 years ago
Other questions:
  • What is 5(3x+2)-2(4x-1)
    13·1 answer
  • Maria handed out 125 flyers that gave students the time and locationtry outs for the school volleyball team. What is 125 written
    9·2 answers
  • james recently installed a new pool in his backyard the pool is 20 ft long 15 feet wide and 5 ft deep, what is the volume
    6·1 answer
  • A pool is filling with water at a constant rate.after 10 minuets the height of the water level is 6 inches.after 15 minuets the
    5·1 answer
  • The relationship between the height of a tree and the time since the tree was planted?
    6·2 answers
  • Find the equation of this line
    15·2 answers
  • If angle y measures 65 degrees how much does x measure?
    15·2 answers
  • Help please! y=2x+1 THATS THE PROBLEM the photos on linked
    15·1 answer
  • What is the explicit form of <br> 30,60,90,120,150,180
    11·2 answers
  • Help me please I need help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!