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zlopas [31]
3 years ago
10

You can use the expression 2e+2w to find the perimeter of a rectangle where e is the length and w is the width. Interpret the co

efficients of the terms.
Mathematics
1 answer:
In-s [12.5K]3 years ago
6 0

Answer: The coefficient of terms is 2 represents length of 2 equal and opposite sides of rectangle.

Step-by-step explanation:

A rectangle is a 4 sides closed quadrilateral where opposite sides are equal .

So , length of one pair of opposite is represented by 'l'  [l= length]

Such that sum of these two sides = l+l=2l

The other pair of opposite sides s represented by 'w'  [w= width]

Such that sum of these two sides = w+w=2w

Perimeter is the sum of sides.

So, perimeter of rectangle = 2l+2w.

The coefficient of terms is 2 represents length of 2 equal and opposite sides of rectangle.

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t is known that the population variance equals 484. With a 0.95 probability, the sample size that needs to be taken if the desir
PtichkaEL [24]

Answer:

The sample size needed to be taken is approximately 74.

Step-by-step explanation:

To get alpha; we have 1 - 0.95 = 0.05

Therefore, z_{\frac{a}{2} }  = \frac{0.05}{2}  = 0.025

The we look up z* in a Standard Normal table where α = 0.025 area in each tail.

From the table, z* = 1.96

From the question variance is 484, then the standard deviation is 22

Standard deviation = \sqrt{Var(x)}  = \sqrt{484}  = 22

And margin of error is 5 or less

The formula for margin of error is given as:

margin of error = \frac{(z^{*}) (SD)}{\sqrt{n} }

5 = \frac{1.96  * 22}{\sqrt{n} } \\5 = \frac{43.12}{\sqrt{n} } \\5 * \sqrt{n}  = 43.12\\(5)^{2}  * (\sqrt{n} )^{2} = (43.12)^2\\25 * n = 1859.3344\\25n =  1859.3344\\\frac{25n}{25}  = \frac{1859.3344}{25} \\n = 74.373376\\n = 74

The approximate value of n is 74.

3 0
3 years ago
14.95 divided by 65 show your estimation and check
Serhud [2]
The answer is 0.23 or 23/100
7 0
3 years ago
PLEASE HELP!! I DON'T UNDERSTAND IT!!
tia_tia [17]
Use the formula  V=Bh

V is 306.52
B is 19.4

to get (h) height you divide

306.52 divided by 19.4= 15.8


3 0
3 years ago
Read 2 more answers
How to find the surface area of an irregular cylinder
Nataly [62]
Https://math.wonderhowto.com/how-to/find-surface-area-cylinder-easily-302679/ the video on this website helped me a lot hope it helps you
8 0
3 years ago
Find the area of a regular hexagon with a radius of 6 in
s344n2d4d5 [400]
Hexagon is a total of 6 triangle
Let find area of one triangle the multiplying with 6
Area of a triangle is A=1/2bh
We know b=6 and h= (6(square root of 3))/2
A= 1/2x6x(6(square root of3))/2=9(square root of 3)
Where square root of 3= 1.732
Area of a triangle=9x1.732 =15.588
Area of Hexagon equals 6 area of triangle so
Area of Hexagon= 6x 15.588=93.53
4 0
4 years ago
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