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Inessa05 [86]
2 years ago
8

The volume of a right cone is 21 pi units. If its circumference measures 6 pi units, find its height.

Mathematics
1 answer:
nydimaria [60]2 years ago
8 0
<h3>\huge\sf\blue{Solution :-}</h3>

<u>Given,</u>

Volume of cone = 21π cm³

& It's Circumference = 6π

Find Radius,

★ Circumference = πr²

=> 6π = πr

=> 6π/π = r

=> r = 6 cm

Now,

★Volume of cone = 1/3πr²h

<h3>=  > 21\pi =  \frac{1}{3} \times 36\pi \times h \\  =  > 21\pi = 12\pi \times h \\  =  >  \frac{21\pi}{12\pi}  = h \\  =  >  \frac{7}{4}  = h \\ \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: =  > h \: = 1.75 \: cm</h3>

<h3>★Hence, The value of height is 1.75 cm</h3>

Hope it helps youu....!!!

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1 year ago
For what value of x is 1/2 x = -9<br><br> x = 18<br> x= -4<br> x=-18<br> x= -36
Luda [366]

Answer:

x = -18

Step-by-step explanation:

Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other.

Multiply 2 to both sides:

(x/2) * 2 = (-9) * 2

x = -9 * 2

x = -18

x = -18 is your answer.

~

4 0
3 years ago
Read 2 more answers
3/4x=-18 what is the answer?
Afina-wow [57]

Answer:

X= 24

Step-by-step explanation:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    3/4*x-(18)=0

Step by step solution :

Step  1  :

           3

Simplify   —

           4

Equation at the end of step  1  :

  3        

 (— • x) -  18  = 0

  4        

Step  2  :

Rewriting the whole as an Equivalent Fraction :

2.1   Subtracting a whole from a fraction

Rewrite the whole as a fraction using  4  as the denominator :

         18     18 • 4

   18 =  ——  =  ——————

         1        4  

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

2.2       Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

3x - (18 • 4)     3x - 72

—————————————  =  ———————

      4              4  

Step  3  :

Pulling out like terms :

3.1     Pull out like factors :

  3x - 72  =   3 • (x - 24)

Equation at the end of step  3  :

 3 • (x - 24)

 ————————————  = 0

      4      

Step  4  :

When a fraction equals zero :

4.1    When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

 3•(x-24)

 ———————— • 4 = 0 • 4

    4    

Now, on the left hand side, the  4  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :

  3  •  (x-24)  = 0

Equations which are never true :

4.2      Solve :    3   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation :

4.3      Solve  :    x-24 = 0

Add  24  to both sides of the equation :

                     x = 24

One solution was found :

                  x = 24

6 0
3 years ago
Hi I need help on this question I’m struggling May someone help me pls and thank u it’s urgent!!!!
kiruha [24]
I believe you’re correct.

y = 3x - 6
8 0
3 years ago
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