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Tatiana [17]
4 years ago
11

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

Mathematics
2 answers:
Elanso [62]4 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]4 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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NORTH RIDGE MIDDLE SCHOOL collected 5,022 cans of food for food drive. Each of the 18 homerooms collected the same number of can
Diano4ka-milaya [45]

Answer:

5022 estimate= 5020  

18 estimate= 20

So, 5022/20

=251

Step-by-step explanation:

The questions says "about" so that means you have to estimate. First, you estimate the cans, then, you estimate the homerooms = 5022 and 20. Last, you have to divide, 5022/20

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Hope it helped!:)

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3 years ago
Find the equation of the line that and I [] is perpendicular to the line y = 3x - 1 passes through the point (7,4).​
Minchanka [31]

The equation of the line that goes through the point (7,4) and is perpendicular to the line y = 3x - 1 is y = -1/3 x + 7.

<h3>What is a slope?</h3>

The slope of a line is found by dividing the "vertical change" by the "horizontal change" between (any) two distinct places on the line. The ratio is sometimes stated as a quotient ("rise over run"), yielding the same value each time.

Given,

The line L₁ equation: y = 3x - 1

Line L intersects the point (x₁, y₁) = (7,4)

To determine the equation of line L.

The equation of a line whose slope and point of intersection are known is given by:

y-y₁ = m (x - x₁)

Where m is the slope of the line and (x₁, y₁) is the point it passes through.

Let L be our needed line.

We've been told that (x₁, y₁) = (7,4).

We also know that the line L is perpendicular to another line L₁, whose equation is:

y = 3x - 1

As a result, the slope of line L₁ is m₁ = 3.

= -1 3m = -1/3 m = -1/3

As a result, the equation for the required line is: y - y₁= m (x - x₁)

y-4 = -1/3(x-7)

3(y - 4) = -(x - 7)

3y-14 =7-x

3y = 14 + 7 - x

3y = - x + 21

y = -1/3 x + 7.

This is the required line equation.

To know more about slope, visit:

brainly.com/question/3605446

#SPJ9

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2 years ago
What was John’s age 4 years ago, if he will be z years old in 5 years?
enot [183]

Answer:

z-9

Step-by-step explanation:

Right now, John is z-5. z-5 - 4 is equal to z -9.

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4 years ago
What is the graphed version of f(x)= 5cos ?
nata0808 [166]

Step-by-step explanation:

it follows the same structure on the x-axis as cosine, but the curve is stretched up an down to reach values between -5 and +5 instead of between -1 and +1

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2 years ago
Plz do have mercy and help me
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I have mercy:

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