Idek what this is lol

Mathematics

1 answer:

STatiana [176]4 years ago

5 0

Answer:

lol means laugh out loud

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Fourteen-year-old Shirley collects one coin from every country that she visits. If she currently has collected 18 coins and want

Anna71 [15]

30 years - 14 years = 16 years
82 coins - 18 coins = 64 coins
64/16 = 4 coins per year or 4 countries per year

Shirley should visit about 4 countries per year.

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3 years ago

The distance driven in miles is proportional to the time driven in hours. Ebony drives at a constant rate and plots her progress

trasher [3.6K]

Answer:

C) 60 mph.

Step-by-step explanation:

If Ebony covers 180 miles in 3 hours as seen in the point (3, 180)

Distance=180 miles; Time = 3 Hours

Driving Rate=Distance/Time = 180/3 = 60mph

7 0

4 years ago

Read 2 more answers

Consider the force field and circle defined below.

grin007 [14]

By Green's theorem,

$\displaystyle\int_{x^2+y^2=9}\vec F(x,y)\cdot\mathrm d\vec r=\iint_D\left(\frac{\partial(xy)}{\partial x}-\frac{\partial(x^2)}{\partial y}\right)\,\mathrm dx\,\mathrm dy=\iint_Dy\,\mathrm dx\,\mathrm dy$

where $C$ is the circle $x^2+y^2=9$ and $D$ is the interior of $C$ , or the disk $x^2+y^2\le1$ .

Convert to polar coordinates, taking

$\begin{cases}x=r\cos\theta\\y=r\sin\theta\end{cases}\implies\mathrm dx\,\mathrm dy=r\,\mathrm dr\,\mathrm d\theta$

Then the work done by $\vec F$ on the particle is

$\displaystyle\iint_Dy\,\mathrm dx\,\mathrm dy=\int_0^{2\pi}\int_0^3(r\sin\theta)r\,\mathrm dr\,\mathrm d\theta=\left(\int_0^{2\pi}\sin\theta\,\mathrm d\theta\right)\left(\int_0^3r^2\,\mathrm dr\right)=\boxed0$