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3 years ago

What is 20 time 4 equal?

Mathematics

2 answers:

IRISSAK [1]3 years ago

3 0

20 multiplied (times) 4 is equal to 80 c:

natita [175]3 years ago

3 0

20 x 4 = 80

hope this helps you

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Find the volume of a can of corn with a diameter of 3 inches and a height of 6 inches

ivanzaharov [21]

volume - pi*r^2*H

Lets use 3.14 for pi

R = radius which is half the diameter so half of 3 is 1.5

H = 6

so volume = 3.14*1.5^2*6 = 42.39in^3

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3 years ago

A store buys 7 sweaters for $42 and sells them for $182. How much profit does the store make per sweater?

sweet [91]

Answer:

better have my money

Step-by-step explanation:

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3 years ago

Estimate the product of 79.623 times 4.83

r-ruslan [8.4K]

It would be 384.58, or 384.57909

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2 years ago

Find the laplace transform of f(t) = cosh kt = (e kt + e −kt)/2

iren2701 [21]

Hello there, hope I can help!

I assume you mean $L\left\{\frac{ekt+e-kt}{2}\right\}$
With that, let's begin

$\frac{ekt+e-kt}{2}=\frac{ekt}{2}+\frac{e}{2}-\frac{kt}{2} \ \textgreater \ L\left\{\frac{ekt}{2}-\frac{kt}{2}+\frac{e}{2}\right\}$

$\mathrm{Use\:the\:linearity\:property\:of\:Laplace\:Transform}$
$\mathrm{For\:functions\:}f\left(t\right),\:g\left(t\right)\mathrm{\:and\:constants\:}a,\:b$
$L\left\{a\cdot f\left(t\right)+b\cdot g\left(t\right)\right\}=a\cdot L\left\{f\left(t\right)\right\}+b\cdot L\left\{g\left(t\right)\right\}$
$\frac{ek}{2}L\left\{t\right\}+L\left\{\frac{e}{2}\right\}-\frac{k}{2}L\left\{t\right\}$

$L\left\{t\right\} \ \textgreater \ \mathrm{Use\:Laplace\:Transform\:table}: \:L\left\{t\right\}=\frac{1}{s^2} \ \textgreater \ L\left\{t\right\}=\frac{1}{s^2}$

$L\left\{\frac{e}{2}\right\} \ \textgreater \ \mathrm{Use\:Laplace\:Transform\:table}: \:L\left\{a\right\}=\frac{a}{s} \ \textgreater \ L\left\{\frac{e}{2}\right\}=\frac{\frac{e}{2}}{s} \ \textgreater \ \frac{e}{2s}$

$\frac{ek}{2}\cdot \frac{1}{s^2}+\frac{e}{2s}-\frac{k}{2}\cdot \frac{1}{s^2}$

$\frac{ek}{2}\cdot \frac{1}{s^2} \ \textgreater \ \mathrm{Multiply\:fractions}: \frac{a}{b}\cdot \frac{c}{d}=\frac{a\:\cdot \:c}{b\:\cdot \:d} \ \textgreater \ \frac{ek\cdot \:1}{2s^2} \ \textgreater \ \mathrm{Apply\:rule}\:1\cdot \:a=a$
$\frac{ek}{2s^2}$

$\frac{k}{2}\cdot \frac{1}{s^2} \ \textgreater \ \mathrm{Multiply\:fractions}: \frac{a}{b}\cdot \frac{c}{d}=\frac{a\:\cdot \:c}{b\:\cdot \:d} \ \textgreater \ \frac{k\cdot \:1}{2s^2} \ \textgreater \ \mathrm{Apply\:rule}\:1\cdot \:a=a$
$\frac{k}{2s^2}$

$\frac{ek}{2s^2}+\frac{e}{2s}-\frac{k}{2s^2}$

Hope this helps!

3 0

3 years ago

A car requires 22 liters of petrol to travel a distance of 259.6 km. Find the amount that the car owner has to pay to travel a d

podryga [215]

Answer:

Step-by-step explanation:

22 liters of petrol to travel 259.6 km

1litres will travel 259.6/22 km

1litres will travel 11.8km

:2013.2km needs 2013.2/11.8litre

:2013.2km needs 170.61litres

And 1 liter of petrol costs $ 1.99

So 742.88 litres will cost $1.99×170.61

= $339.51

6 0

3 years ago

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