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3 years ago

How do I show work ? Plz help me

Mathematics

2 answers:

Nata [24]3 years ago

4 0

Draw the shape and if you do that try imagining cutting it in half <span />

nadya68 [22]3 years ago

3 0

A circle because if you cross-section it its like cutting it in half horizontally. So its like seeing it from the top view and you would see a circle.

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Evaluate the line integral, where c is the given curve. c y3 ds,<br> c.x = t3, y = t, 0 ≤ t ≤ 4

vivado [14]

The path $C$ is parameterized by

$\mathbf r(t)=\langle x(t),y(t)\rangle=\langle t^3,t\rangle$

with $0\le t\le4$ .

We have

$\dfrac{\mathrm d\mathbf r}{\mathrm dt}=\langle3t^2,1\rangle$
$\left\|\dfrac{\mathrm d\mathbf r}{\mathrm dt}\right\|=\sqrt{9t^4+1}$

So the line integral is

$\displaystyle\int_Cy^3\,\mathrm dS=\int_{t=0}^{t=4}t^3\sqrt{9t^4+1}\,\mathrm dt$

Substitute $u=9t^4+1$ , so that $\mathrm du=36t^3\,\mathrm dt$ .

$=\displaystyle\frac1{36}\int_{u=1}^{u=2305}\sqrt u\,\mathrm du$
$=\dfrac{2305^{3/2}-1}{54}$
$\approx2049.31$

3 0

3 years ago

I need help asap please

qwelly [4]

The slope is 4/3 because rise over run (if u have heard of that expression)

5 0

3 years ago

Fb+3b=d what does d equal

Sedbober [7]

Answer:

it can`t be solved unless you have an integer in place of F and B

otherwise this can`t be solved

6 0

3 years ago

Read 2 more answers

Mira has breakfast at a restaurant. She leaves a 20% tip of $1.80

Sedaia [141]

Let x be the price of the breakfast.

We know that 20 percent of x is 1.80

Let's write this as a mathematical equation

0.2 x = 1.8

Let's divide both sides by 0.2 to isolate the x

x = 1.8 / 0.2

= 9

The price of the breakfast was $9.

Have an awesome day! :)

7 0

3 years ago

A sailboat travels 48 miles upstream in 6 hours and return back downstream in 4 hours. What is the speed of the boat in still wa

Kipish [7]

Let s be the speed of the boat in still water.
Let c be the speed of the current.
s - c = 48/6 = 8
s + c = 48/4 = 12
Adding the two equations, we get:
2s = 20
s = 10
The answer is 10 miles per hour.

4 0

3 years ago