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Question Number 188392 Answers: 2 Comments: 3

Question Number 188387 Answers: 2 Comments: 0

Question Number 188384 Answers: 1 Comments: 0

if ∫_0 ^∞ e^(−ax) dx = (1/a) show that ∫_0 ^∞ e^(−ax) x^n dx = ((n!)/a^(n+1) )

$$\:\:\: \\ $$$$\:\:\:\mathrm{if}\:\:\:\:\int_{\mathrm{0}} ^{\infty} {e}^{−{ax}} {dx}\:\:=\:\:\frac{\mathrm{1}}{{a}} \\ $$$$\:\:\:\:\:\:\:\:{show}\:{that}\:\:\int_{\mathrm{0}} ^{\infty} {e}^{−{ax}} \:{x}^{{n}} {dx}\:\:=\:\:\frac{{n}!}{{a}^{{n}+\mathrm{1}} } \\ $$

Question Number 188381 Answers: 2 Comments: 0

Advanced calculus Find the value of the following series. Ω = Σ_(n=1) ^∞ (( (−1)^( n) ζ ( n ))/(n. 2^( n) )) = ? ζ ( z ) = Σ_( n=1) ^∞ (( 1)/(n^( z) )) ; Re ( z )>1

$$ \\ $$$$\:\:\:\:\:\:\:\:\:\:\mathrm{Advanced}\:\:\mathrm{calculus} \\ $$$$ \\ $$$$\:\:\:\:\:\mathrm{Find}\:\:\mathrm{the}\:\:\mathrm{value}\:\:\mathrm{of}\:\mathrm{the}\:\mathrm{following}\:\mathrm{series}. \\ $$$$ \\ $$$$\:\:\:\:\:\:\:\:\:\Omega\:=\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\:\frac{\:\left(−\mathrm{1}\right)^{\:{n}} \:\zeta\:\left(\:{n}\:\right)}{{n}.\:\mathrm{2}^{\:{n}} }\:=\:? \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\zeta\:\left(\:{z}\:\right)\:=\:\underset{\:{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{\:\mathrm{1}}{{n}^{\:{z}} \:}\:\:\:\:\:;\:\:\:\:\mathscr{R}{e}\:\left(\:{z}\:\right)>\mathrm{1} \\ $$$$ \\ $$

Question Number 188380 Answers: 1 Comments: 0

Question Number 188379 Answers: 0 Comments: 0

Question Number 188378 Answers: 1 Comments: 0

Question Number 188377 Answers: 0 Comments: 0

Question Number 188376 Answers: 1 Comments: 0

Question Number 188375 Answers: 1 Comments: 2

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Question Number 189462 Answers: 0 Comments: 0

Question Number 188366 Answers: 1 Comments: 0

xlnx=7 x?

$${xlnx}=\mathrm{7}\:\:\:\:\: \\ $$$${x}? \\ $$

Question Number 188362 Answers: 2 Comments: 0

find the number of 5 digit natural numbers with strictly ascending digits whose sum is 20. example: 12458 is such a number

$${find}\:{the}\:{number}\:{of}\:\mathrm{5}\:{digit}\:{natural} \\ $$$${numbers}\:{with}\:{strictly}\:{ascending}\: \\ $$$${digits}\:{whose}\:{sum}\:{is}\:\mathrm{20}. \\ $$$${example}:\:\mathrm{12458}\:{is}\:{such}\:{a}\:{number} \\ $$

Question Number 188360 Answers: 2 Comments: 0

Question Number 188359 Answers: 1 Comments: 0

Question Number 188351 Answers: 2 Comments: 0

(√x)+(√(3x−2))=x^2 +1

$$\sqrt{{x}}+\sqrt{\mathrm{3}{x}−\mathrm{2}}={x}^{\mathrm{2}} +\mathrm{1} \\ $$

Question Number 188348 Answers: 0 Comments: 1

Question Number 188536 Answers: 2 Comments: 0

solve the equation; {: ((x + y − z =5)),((z − yx = 7)),((z = 1 + x)) } x;y;z =??

$$ \\ $$$$\:\:\:\:\boldsymbol{{solve}}\:\boldsymbol{{the}}\:\boldsymbol{{equation}}; \\ $$$$\:\:\:\:\:\:\:\left.\begin{matrix}{\boldsymbol{{x}}\:+\:\boldsymbol{{y}}\:−\:\boldsymbol{{z}}\:=\mathrm{5}}\\{\boldsymbol{{z}}\:−\:\boldsymbol{{yx}}\:=\:\mathrm{7}}\\{\boldsymbol{{z}}\:=\:\mathrm{1}\:+\:\boldsymbol{{x}}}\end{matrix}\right\}\:\:\boldsymbol{{x}};\boldsymbol{{y}};\boldsymbol{{z}}\:=??\:\:\:\:\:\: \\ $$$$ \\ $$

Question Number 188535 Answers: 1 Comments: 0

Question Number 188534 Answers: 1 Comments: 0

Question Number 188343 Answers: 1 Comments: 0

Find: Ω = Σ_(n=1) ^∞ (lim_(x→0) (1 - ((5 - (√(25 - x^2 )))/x) )^((5n)/x) )

$$\mathrm{Find}:\:\Omega\:=\:\underset{\boldsymbol{\mathrm{n}}=\mathrm{1}} {\overset{\infty} {\sum}}\:\left(\underset{\boldsymbol{\mathrm{x}}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\left(\mathrm{1}\:-\:\frac{\mathrm{5}\:-\:\sqrt{\mathrm{25}\:-\:\mathrm{x}^{\mathrm{2}} }}{\mathrm{x}}\:\right)^{\frac{\mathrm{5}\boldsymbol{\mathrm{n}}}{\boldsymbol{\mathrm{x}}}} \:\right) \\ $$

Question Number 188339 Answers: 1 Comments: 0

Question Number 188336 Answers: 1 Comments: 0

Question Number 188325 Answers: 0 Comments: 1

A polytank contains 3600cm^(3 ) of water. A boy threw a stone to the tank and some of the water leaked away. When the owner realized only 319cm^3 of water was left. If 1cm^(2 ) of water cost 20peswas, calculate the lost.

$$\:{A}\:{polytank}\:{contains}\:\mathrm{3600}{cm}^{\mathrm{3}\:} \:{of}\: \\ $$$${water}.\:{A}\:{boy}\:{threw}\:{a}\:{stone}\:{to}\:{the}\: \\ $$$${tank}\:{and}\:{some}\:{of}\:{the}\:{water}\:{leaked}\: \\ $$$${away}.\:{When}\:{the}\:{owner}\:{realized}\:{only} \\ $$$$\mathrm{319}{cm}^{\mathrm{3}} \:{of}\:{water}\:{was}\:{left}.\:{If}\:\mathrm{1}{cm}^{\mathrm{2}\:} \\ $$$${of}\:{water}\:{cost}\:\mathrm{20}{peswas},\:{calculate}\: \\ $$$${the}\:{lost}. \\ $$

Question Number 188324 Answers: 0 Comments: 2

A contractor wants to plaster wall which is 2650m. He sends 50 masons to do the work equally, what size of the work does each mason plaster. If a square cost Ghc12 , how much does each mason earn.

$$\:\:{A}\:{contractor}\:{wants}\:{to}\:{plaster}\:{wall} \\ $$$$\:{which}\:{is}\:\mathrm{2650}{m}.\:{He}\:{sends}\:\mathrm{50}\:{masons} \\ $$$$\:{to}\:{do}\:{the}\:{work}\:{equally},\:{what}\:{size}\:{of} \\ $$$${the}\:{work}\:{does}\:{each}\:{mason}\:{plaster}.\: \\ $$$${If}\:{a}\:{square}\:{cost}\:{Ghc}\mathrm{12}\:,\:{how}\:{much}\: \\ $$$${does}\:{each}\:{mason}\:{earn}. \\ $$

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