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2 years ago

What division problem can be represented using the number line?

Mathematics

2 answers:

nexus9112 [7]2 years ago

8 0

Answer:its b

Step-by-step explanation:

edge 2020

Marina86 [1]2 years ago

4 0

Answer:

Step-by-step explanation:

The other person is wrong I did the math.

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Which of the following are solutions of the equation ? + 18 = 82?

vazorg [7]

Answer:

Step-by-step explanation:

if you do 64 + 18 you will get 82.

4 0

3 years ago

Martey drew a model of the shool library

vova2212 [387]

Answer:

Step-by-step explanation:

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2 years ago

The surface area of a cylinder is increasing at a rate of 9 pi square meters per hour. The height of the cylinder is fixed at 3

Alekssandra [29.7K]

Answer:

$9\pi \text{ cubic meters per hour}$

Step-by-step explanation:

Since, the surface area of a cylinder,

$A= 2\pi r^2 + 2\pi rh$ ................(1)

Where,

r = radius,

h = height,

If $A= 36\pi\text{ square meters}, h = 3\text{ meters}$

$36\pi = 2\pi r^2 + 2\pi r(3)$

$18 = r^2 + 3r$

$\implies r^2 + 3r - 18=0$

$r^2 + 6r - 3r - 18 = 0$ ( by middle term splitting )

$r(r+6)-3(r+6)=0$

$(r-3)(r+6)=0$

By zero product property,

r = 3 or r = - 6 ( not possible )

Thus, radius, r = 3 meters,

Now, differentiating equation (1) with respect to t ( time ),

$\frac{dA}{dt}= 4\pi r\frac{dr}{dt} +2\pi(r\frac{dh}{dt} + h\frac{dr}{dt})$

∵ h = constant, ⇒ dh/dt = 0,

$\frac{dA}{dt} = 4\pi r \frac{dr}{dt} +2\pi h \frac{dr}{dt}$

We have, $\frac{dA}{dt}=9\pi\text{ square meters per hour}, r = h = 3\text{ meters}$

$9\pi = 4\pi (3) \frac{dr}{dt}+2\pi (3)\frac{dr}{dt}$

$9\pi = (12\pi + 6\pi )\frac{dr}{dt}$

$9\pi = 18\pi \frac{dr}{dt}$

$\implies \frac{dr}{dt} =\frac{1}{2}\text{ meter per hour}$

Now,

Volume of a cylinder,

$V=\pi r^2 h$

Differentiating w. r. t. t,

$\frac{dV}{dt}=\pi ( r^2 \frac{dh}{dt}+h(2r)\frac{dr}{dt})=\pi ((3)(6) (\frac{1}{2})) = 9\pi \text{ cubic meters per hour}$

6 0

3 years ago

How who I complete the table?

Natalka [10]

Answer:

Step-by-step explanation:

you have to remove // to calculate

5 0

3 years ago

Alan has read 80 percent of a book . He has 16 more pages to finish. How many pages are in the book

Jet001 [13]

Answer:

Step-by-step explanation:

To have 16 more pages means he has 20% more of the book to cover if he has already covered 80%

Let the number of pages in the book be X

20% of X = 16

20/ 100. * X = 16

1/ 5 * X = 16 >>> X = 16 * 5 = 80 pages.

3 0

3 years ago