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3 years ago

A cylinder is a radius of 8cm and a volume of 800cm³ calculate it's height and total surface area

Mathematics

1 answer:

Anastaziya [24]3 years ago

3 0

Answer:

3.98 cm, 602.18 cm²

Step-by-step explanation:

Given:

r= 8 cm
V= 800 cm³

To find:

h = ?
S = ?

Solution:

V = πr²h
h = V/πr² = 800/(π8²) = 3.98 cm
S = 2πr (r+h) = 16π(8+3.98) = 602.18 cm²

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Solve -4x^2+3x=-5 using quadratic formula

Akimi4 [234]

Answer:

Step-by-step explanation:

Here, we want to solve the given quadratic equation using the quadratic formula

We need to rewrite the equation in the standard form;

-4x^2 + 3x + 5 = 0

we have the value a as -4

value b as 3

C = 5

we then substitute these values into the quadratic formula as seen in the attachment

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3 years ago

Compare the two fractions using <, >, or =. 6/12 ___ 1/2

Mice21 [21]

Answer:

6/12=1/2

Step-by-step explanation:

6/12_1/12

Reduce 6/12 into lowest form

6/12=1/2

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1/2_1/2

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6 0

3 years ago

Read 2 more answers

Martina is currently 14 years older than her cousin Joey. In 5 years she will be 3 times as old as Joey. How old is Martina? How

Rufina [12.5K]

Answer:

Joey is 2 years old and Martine is 16 years old.

Step-by-step explanation:

5 0

3 years ago

The measure of one angle of an octagon is two times smaller that of the other seven angles. What is the measure of each angle?

Anestetic [448]

Answer:

7 of the angles measure 144 degrees each and one angle measures 72 degrees

Step-by-step explanation:

Let

x -----> represent the measures of the seven same-size angles,

x/2 ----> represent the measure of the one that is "two times smaller."

we know that

The sum of internal angles of a polygon can be calculated as:

$S=180^o(n-2)$

where

n is the number of sides of the polygon

In this case

n=8 (octagon)

substitute

$S=180^o(8-2)=1,080^o$

The linear equation that represent this problem is

$\frac{x}{2}+7x=1,080$

solve for x

$\frac{15x}{2}=1,080\\\\15x=2,160\\\\x=144^o$

$\frac{x}{2}=72^o$

therefore

7 of the angles measure 144 degrees each and one angle measures 72 degrees

7 0

3 years ago

Left f(x)=|x| and g(x)=x+2. what are the domain and range of (f°g)(x)

mr_godi [17]

Answer:

$(fog)(x)=|x+2|$

$Dom_{fog} = R$

$Range_{fog}=[0,\infty)$

Step-by-step explanation:

5 0

3 years ago