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3 years ago

Clara and Miles each improved their yards by planting

Mathematics

1 answer:

Semenov [28]3 years ago

5 0

Answer:

Step-by-step explanation:

Rose bushes = 8 dollars

daisy pots = 9 dollars

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Adrian works ata carwash and makes $12 an hour. How many hours dothey have to work to save atleast $1200 over the summer?

Mashcka [7]

Answer:

100 minimum

Step-by-step explanation:

because 100 times 12 equals 1200

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3 years ago

Find the highest common factor [HCF] of 10 and 17

s2008m [1.1K]

Answer

Step by step explanation

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2 years ago

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Write the log equation<br> as an exponential equation.<br> log (x) = x

krok68 [10]

Answer:(x)=10^x

Step-by-step explanation:

Log(x)=x

(x)=10^x

8 0

4 years ago

A train leaves a station at 10:40 a.m. and arrives at its destination at 1:20 p.m. Find the distance between the stations if the

Katena32 [7]

Average speed = distance / time

60 = distance / (13.20 - 10.40)

13.20 - 10.40 = 2 hours 40 minutes = 2 2/3 hours

60 = distance / 8/3 = 3 d / 8 (where d = distance)

3d = 480

d = 480/3 = 160 miles Answer

4 0

4 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