2 years ago

Need help I’m very confused

Mathematics

1 answer:

ololo11 [35]2 years ago

5 0

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I have been stuck on this forever plz help <br> What is the surface area of this cylinder

Andrei [34K]

Answer:

1865.16 m^2

Step-by-step explanation:

first let 's find radius of a circle

radius=diameter/2

=18/2

=9 m

area of a cylinder=2πrh+2πr2

=2*3.14*9*24 + 2*3.14*(9)^2

=1356.48 + 2*3.14*81

=1356.48 + 508.68

=1865.16 m^2

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2 years ago

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Write the standard form of the equation of the line passing through the point -2, two and perpendicular to the line 5x-y=-4

PtichkaEL [24]

Answer:

Step-by-step explanation:

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2 years ago

What is the value of the number in the thousandths place 7.819

kvasek [131]

9 is in the thousandths place

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2 years ago

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1. For a certain type of tropical fish, it is recommended

Nookie1986 [14]

Answer:

We can have 7 fish in fish tank containing 35 gallons of water.

Step-by-step explanation:

Given:

2 fish per 10 gallons

∴ 1 fish can be in = $\frac{10}{2}=5 \ gallons$

To find Number of fish in 35 gallons of water

Number of fish in 35 gallons would be = $\frac{35}{\text{Number of gallons for 1 fish}} = \frac{35}{5}= 7$

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3 years ago

The combined area of a pair of congruent rectangles can be represented, in square units, by the expression 18y^2-818y 2 −8. The

sveta [45]

Answer:

$Perimeter = 12y$

Step-by-step explanation:

Given

$Area = 18y^2 - 8$ -- two rectangles

Required

Determine the perimeter of one of the rectangles

First, calculate the area (A) of 1 rectangle

$A =\frac{1}{2}Area$

$A =\frac{1}{2}(18y^2 - 8)$

$A =9y^2 - 4$

Express as difference of two squares

$A =(3y - 2)(3y+2)$

Area is calculated as:

$A = Length * Width$

So, by comparison:

$Length = 3y - 2$

$Width = 3y + 2$

The perimeter is:

$Perimeter = 2 *(Length + Width)$

$Perimeter = 2 *(3y-2+3y+2)$

Collect Like Terms

$Perimeter = 2 *(3y+3y-2+2)$

$Perimeter = 2 *(6y)$

$Perimeter = 12y$

8 0

2 years ago