All categories

3 years ago

The area of a 20 cm wide rectangle is 500 cm cm2 what is the length?

Mathematics

2 answers:

ziro4ka [17]3 years ago

8 0

Given = b = 20cm, A = 500cm2 l=?

A = l×b,

500= l×20

l= 25

THE LENGTH IS 25 CM

il63 [147K]3 years ago

7 0

Answer:

25 cm

Step-by-step explanation:

area of a rectangle = length × breadth

500 = length × 20

500/ 20 = length

25 = length

therfore, the length of the rectangle is 25 cm

You might be interested in

Families USA, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It fo

Harman [31]

Answer:

(a) The 90 percent confidence interval for the population mean yearly premium is ($10,974.53, $10983.47).

(b) The sample size required is 107.

Step-by-step explanation:

(a)

The (1 - α)% confidence interval for population mean is:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\times \frac{s}{\sqrt{n}}$

Given:

$\bar x=\$10,979\\s=\$1000\\n=20$

Compute the critical value of t for 90% confidence level as follows:

$t_{\alpha/2, (n-1)}=t_{0.10/2, (20-1)}=t_{0.05, 19}=1.729$

*Use a t-table.

Compute the 90% confidence interval for population mean as follows:

$CI=\bar x\pm t_{\alpha/2, (n-1)}\times \frac{s}{\sqrt{n}}$

$=10979\pm 1.729\times \frac{1000}{\sqrt{20}}\\=10979\pm4.47\\ =(10974.53, 10983.47)$

Thus, the 90 percent confidence interval for the population mean yearly premium is ($10,974.53, $10983.47).

(b)

The margin of error is provided as:

MOE = $250

The confidence level is, 99%.

The critical value of z for 99% confidence level is:

$z_{\alpha/2}=z_{0.01/2}=z_{0.005}=2.58$

Compute the sample size as follows:

$MOE= z_{\alpha/2}\times \frac{s}{\sqrt{n}}$

$n=[\frac{z_{\alpha/2}\times s}{MOE} ]^{2}$

$=[\frac{2.58\times 1000}{250}]^{2}$

$=106.5024\\\approx107$

Thus, the sample size required is 107.

4 0

3 years ago

The ordered pairs model an exponential function, where j is the function name and e is the input variable.

yKpoI14uk [10]

Answer:

2(5^e)

Step-by-step explanation:

the answer is 2(5^e)

because

2(5^1)= 10

2(5^2)=50

2(5^3)=250

2(5^4)=1250

and e is the input variable

6 0

3 years ago

BRAINLIEST, URGENT

stira [4]

Answer:

12.5 m

Step-by-step explanation:

1st drop 50 m

2nd drop 50/2 = 25 m

3rd drop 25/2 = 12.5 m

4 0

2 years ago

What is the value of 6 divided by 3/8

V125BC [204]

16 because 3 divided by 8 is 0.375 and 6 divided by 0.375 is 16.

3 0

3 years ago

I need to find how many solutions does the system have.

REY [17]

From what I got there is one real solution :)

Rearrange the second equation to give y=2-2x, substitute into the first equation to give you a value for x and then using that you can work out y for the exact coordinates of intersection :)

Also they are both straight line graphs so they will either have one or no solutions

Hope this helped :)

4 0

3 years ago