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3 years ago

Question 16..........

Mathematics

2 answers:

Elanso [62]3 years ago

7 0

Since the diameter is 6 cm, the radius is 3 cm. Use the area formula to get 113.04 cm squared. Then, you multiply that by the height of the rod, which is 20 cm. The volume of one rod is 2260.8 cm cubed. To find how much steel is needed for 189 rods, multiple the volume of one rod by 189. Your answer should be 427291.2 cm³.

iris [78.8K]3 years ago

7 0

If the cylinder-shaped rods are solid (not hollow), then the amount of steel needed to make a rod is the same as the volume of the rod. Multiply that by 189 to get the amount of steel needed to make 189 rods.
Area of a cylinder = pi*r*r*h
r = diameter/2 = 6/2 = 3
h = 20
Area=189(pi*3*3*20)=189(pi*180)
The question says to use 3.14 as pi, so:
189(pi*180)=189(3.14*180)=189(565.2)=106822.8
A cylinder is three dimensional so the unit is cm^3
Answer: 106822.8 cm^3
565.2*189

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Answer:

REQUIRED TEST STATICS IS 35.19

Step-by-step explanation:

total size of sample = 10,000

men women

voted 2777 3466

did not vote 1444 2313

By chi square test we can find the relationship between gender and participation in the election

$X^2 = \frac{ N(ad-bc)^2}{(a+c)(b+d)+(a+b)(c+d)}$

where

a represent = 2777, b = 3466, c= 1444, d = 2313, N = 10000

Putting values to get chis square statics

$X^2 = \frac{ 10000(2777*2313-3466*1444)^2}{(2777+1444)(3466+2313)+(2777+3466)(1444+2313)}$

$X^2 = = 35.159$

HENCE REQUIRED TEST STATICS IS 35.19

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3 years ago

Are any of these a function

Elena-2011 [213]

Answer:

Yes because the 1st and 3rd one are functions

Step-by-step explanation:

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3 years ago

A store is instructed by corporate headquarters to put a markup of 25% on all items. An item costing $16 is displayed by the s

tigry1 [53]

Answer:

$20

Step-by-step explanation:

the manager's error could likely be putting the percentage mark up rather than the markup price added to the original price

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2 years ago

Analyze the data represented in the table and select the appropriate model

Inessa05 [86]

Answer: Option B, a linear relation.

Step-by-step explanation:

Let's analyze the points in the data:

the first 3 pairs are: (0,14.70) (10,19.03) and (20, 23.36)

We can see the differences between consecutive points and see if the relation is linear:

(10,19.03) - (0,14.70) = ( 10 - 0, 19.03 - 14.70) = (10, 4.33) now we need to see the quotient: 4.33/10 = 0.433

(20, 23.36) - (10,19.03) = (20 - 10, 23.36 - 19.03) = (10, 4.33), and the quotient is the same as before.

This means that the relation is a linear relation, where the slope os 0.433 and the x-intercept is 14.70, so the equation can be written as:

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3 0

3 years ago

$700 is invested at 4% per annum. How long will it take for the amount to reach $784?

Blababa [14]

Answer:

3yrs

Step-by-step explanation:

Given parameters:

Capital = $700

Percentage interest = 4% per annum

Unknown:

Time it will take for amount to be = $784

Solution:

To find the simple interest on an amount;

I = $\frac{PRT}{100}$

P is the principal

R is the rate

T is the time

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Insert the parameters:

I = $\frac{700x 4 x T}{100}$

I = 28T

So;

At the end of the duration:

Principal + Interest = Amount

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28T = 784 - 700

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T = 3yrs

5 0

2 years ago