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2 years ago

SOMEONE PLEASE HELP ME!!!!! I NEED THIS!

Mathematics

1 answer:

snow_tiger [21]2 years ago

7 0

Answer:

QR ≈ 16.3

Step-by-step explanation:

Since the figures are similar then the ratios of corresponding sides are equal, that is

$\frac{MN}{QR}$ = $\frac{MP}{QT}$ , substitute values

$\frac{40.3}{QR}$ = $\frac{57}{23}$ ( cross- multiply )

57 QR = 926.9 ( divide both sides by 57 )

QR ≈ 16.3 ( to the nearest tenth )

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Find the surface area of the surface given by the portion of the paraboloid z=3x2+3y2 that lies inside the cylinder x2+y2=4. (hi

natta225 [31]

Parameterize the part of the paraboloid within the cylinder - I'll call it $S$ - by

$\mathbf r(u,v)=\langle x(u,v),y(u,v),z(u,v)\rangle=\left\langle u\cos v,u\sin v,3u^2\right\rangle$

with $0\le u\le2$ and $0\le v\le2\pi$ . The region's area is given by the surface integral

$\displaystyle\iint_S\mathrm dS=\int_{u=0}^{u=2}\int_{v=0}^{v=2\pi}\|\mathbf r_u\times\mathbf r_v\|\,\mathrm du\,\mathrm dv$
$=\displaystyle\int_{v=0}^{v=2\pi}\int_{u=0}^{u=2}u\sqrt{1+36u^2}\,\mathrm du\,\mathrm dv$
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Take $w=1+36u^2$ so that $\mathrm dw=72u\,\mathrm du$ , and the integral becomes

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2 years ago

What is the mean absolute deviation? With these numbers.<br> 2, 8, 10, 12.<br> Please help :)

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Step-by-step explanation:

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2 years ago

Read 2 more answers

John earns $50 less than three times as much as Sam each week. Together Sam and John earn $1200 A week. How much does Sam earn q

docker41 [41]

Answer:

The earning of Sam is $312.5

Step-by-step explanation:

Given as :

The total earning of John and Sam together = $1200 per week

Let the earning of sam each week = x

So, The earning of John is ( 3 x - $50 )

Now, According to question

John earning + Sam earning = $1200 per week

So, ( 3 x - $50 ) + x = $1200

Or, 4 x - $50 = $1200

Or, 4 x = $1200 + $50

Or, 4 x = $1250

∴ x = $\frac{1250}{4}$ = $312.5

And ( 3 x - $50 ) = 3 × $312.5 - $50

So, = $ 887.5

Hence The earning of Sam is $312.5 Answer

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2 years ago

Nine less than twice the height H

PIT_PIT [208]

Answer:

2h-9

Step-by-step explanation:

Twice the height of h would be 2H and 9 less from that would be 2h-9

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2 years ago

A metallurgist has an alloy with 10% titanium and an alloy with 20% titanium. He needs 100 grams of an alloy with 17% titaniu

ser-zykov [4K]

$\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentration\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{10\% alloy}&x&0.1&0.1x\\
\textit{20\% alloy}&y&0.2&0.2y\\
-----&-----&-------&-------\\
mixture&100&0.17&17
\end{array}$

now, notice, we use the decimal format for the percent, namely 17% is 17/100 or 0.17 and so on

so.... we know, whatever "x" and "y" is, they must add up to 100 grams
thus x + y = 100

and whatever the concentrated amount is, it must add up to 17 grams for the composition

thus 0.1x + 0.2y = 17

$\bf \begin{cases}
x+y=100\implies \boxed{y}=100-x\\
0.1x+0.2y=17\\
----------\\
0.1x+0.2\left( \boxed{100-x} \right)=17
\end{cases}$

solve for "x", to see how much is needed of the 10% alloy

what about "y"? well, y = 100 - x

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2 years ago