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3 years ago

Which inequality is a true statement?

Mathematics

1 answer:

frozen [14]3 years ago

5 0

Answer:

b and e please give brain THX hope this helps

Step-by-step explanation:

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What is equivalent to 81 1/3

g100num [7]

1/3 of 81 = 81 • 1/3 = 81/3 = 27

5 0

3 years ago

Find the area of the helicoid (or spiral ramp) with vector equation r(u, v) = ucos(v) i + usin(v) j + v k, 0 ≤ u ≤ 1, 0 ≤ v ≤ 9π

Natasha2012 [34]

Let $H$ denote the helicoid parameterized by

$\mathbb r(u,v)=u\cos v\,\mathbf i+u\sin v\,\mathbf j+v\,\mathbf k$

for $0\le u\le1$ and $0\le v\le9\pi$ . The surface area is given by the surface integral,

$\displaystyle\iint_H\mathrm dS=\iint_H\|\mathbf r_u\times\mathbf r_v\|\,\mathrm du\,\mathrm dv$

We have

$\mathbf r_u=\dfrac{\partial\mathbf r(u,v)}{\partial u}=\cos v\,\mathbf i+\sin v\,\mathbf j$
$\mathbf r_v=\dfrac{\partial\mathbf r(u,v)}{\partial v}=-u\sin v\,\mathbf i+u\cos v\,\mathbf j+\mathbf k$
$\implies\mathbf r_u\times\mathbf r_v=\sin v\,\mathbf i-\cos v\,\mathbf j+u\,\mathbf k$
$\implies\|\mathbf r_u\times\mathbf r_v\|=\sqrt{1+u^2}$

So the area of $H$ is

$\displaystyle\iint_H\mathrm dS=\int_{v=0}^{v=9\pi}\int_{u=0}^{u=1}\sqrt{1+u^2}\,\mathrm du\,\mathrm dv$
$=\dfrac{9(\sqrt2+\sinh^{-1}(1))\pi}2$

5 0

3 years ago

12.8 x 3/4 I don’t know it

scoray [572]

48/5 or 9 3/5

12.8/1 x 3/4 = 38.4/4

Or multiply 12.8/1 by 10 ==> 128/10

128/10 x 3/4 = 384/40

Hope this helps!

7 0

3 years ago

Read 2 more answers

I think I have the right answer but i want to check. whats 9/2 ÷ 3/8

velikii [3]

Answer:

Step-by-step explanation:

flip the equations to multiplication

9/2×8/3

reduce numbers with greatest common factor 3

3/2×8

reduce number of greatest common factor 2

3×4

12 is the answer

7 0

3 years ago

Ty makes balloon animals for birthday parties and wants to know what color balloons to buy. He surveys the 30 children closest t

SashulF [63]

C. convenience ;)))))))))))))

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3 years ago