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Question Number 11754 Answers: 1 Comments: 0

How many numbers between 1 − 2017 that aren′t divisible by 5, 6, 7, 8 ?

$$\mathrm{How}\:\mathrm{many}\:\mathrm{numbers}\:\mathrm{between}\:\mathrm{1}\:−\:\mathrm{2017} \\ $$$$\mathrm{that}\:\mathrm{aren}'\mathrm{t}\:\mathrm{divisible}\:\mathrm{by}\:\mathrm{5},\:\mathrm{6},\:\mathrm{7},\:\mathrm{8}\:? \\ $$

Question Number 11753 Answers: 2 Comments: 0

a, b, c are the roots from equation x^3 − 5x^2 − 9x + 10 = 0 If P(x) = Ax^3 + Bx^2 + Cx − 2015 and P(a) = b + c P(b) = a + c P(c) = a + b What is the value of A + B + C ?

$${a},\:{b},\:{c}\:\mathrm{are}\:\mathrm{the}\:\mathrm{roots}\:\mathrm{from}\:\mathrm{equation}\:{x}^{\mathrm{3}} \:−\:\mathrm{5}{x}^{\mathrm{2}} \:−\:\mathrm{9}{x}\:+\:\mathrm{10}\:=\:\mathrm{0} \\ $$$$\mathrm{If}\:{P}\left({x}\right)\:=\:{Ax}^{\mathrm{3}} \:+\:{Bx}^{\mathrm{2}} \:+\:{Cx}\:−\:\mathrm{2015}\:\mathrm{and} \\ $$$${P}\left({a}\right)\:=\:{b}\:+\:{c}\: \\ $$$${P}\left({b}\right)\:=\:{a}\:+\:{c} \\ $$$${P}\left({c}\right)\:=\:{a}\:+\:{b} \\ $$$$\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:{A}\:+\:{B}\:+\:{C}\:? \\ $$

Question Number 11751 Answers: 1 Comments: 0

Simplify: sin(6θ)

$$\mathrm{Simplify}:\:\mathrm{sin}\left(\mathrm{6}\theta\right) \\ $$

Question Number 11748 Answers: 1 Comments: 0

Solve simultaneously x^2 + 4y^2 + xy = 6 .............. equation (i) 3x^2 + 8y^2 = 14 .............. equation (ii)

$$\mathrm{Solve}\:\mathrm{simultaneously} \\ $$$$\mathrm{x}^{\mathrm{2}} \:+\:\mathrm{4y}^{\mathrm{2}} \:+\:\mathrm{xy}\:=\:\mathrm{6}\:\:\:\:\:..............\:\mathrm{equation}\:\left(\mathrm{i}\right) \\ $$$$\mathrm{3x}^{\mathrm{2}} \:+\:\mathrm{8y}^{\mathrm{2}} \:=\:\mathrm{14}\:\:\:\:\:\:\:\:\:\:\:..............\:\mathrm{equation}\:\left(\mathrm{ii}\right) \\ $$

Question Number 11743 Answers: 1 Comments: 0

9/3(6×4/8)=?

$$\mathrm{9}/\mathrm{3}\left(\mathrm{6}×\mathrm{4}/\mathrm{8}\right)=? \\ $$

Question Number 11744 Answers: 1 Comments: 0

If 5^(n+2) = 625 , find [5(n+3)]^(1/n) .

$$\mathrm{If}\:\:\:\mathrm{5}^{\mathrm{n}+\mathrm{2}} =\:\mathrm{625}\:,\:\mathrm{find}\:\left[\mathrm{5}\left(\mathrm{n}+\mathrm{3}\right)\right]^{\mathrm{1}/{n}} . \\ $$

Question Number 11741 Answers: 1 Comments: 0

∫xtan^2 x dx=?

$$\int\mathrm{xtan}^{\mathrm{2}} \:\mathrm{x}\:\mathrm{dx}=? \\ $$

Question Number 11740 Answers: 0 Comments: 0

Metal pellets of mass 0.1 kg are fired into an iron plate of large mass m and specific heat capacity c at a temperature of 15°C . 25% of the kinetic energy of the pellets is converted thermal energy and the plate temperature rises to 16°C. The average speed of the pellets before hitting the plate was ?

$$\mathrm{Metal}\:\mathrm{pellets}\:\mathrm{of}\:\mathrm{mass}\:\mathrm{0}.\mathrm{1}\:\mathrm{kg}\:\mathrm{are}\:\mathrm{fired}\:\mathrm{into}\:\mathrm{an}\:\mathrm{iron}\:\mathrm{plate}\:\mathrm{of}\:\mathrm{large}\:\mathrm{mass}\:\mathrm{m} \\ $$$$\mathrm{and}\:\mathrm{specific}\:\mathrm{heat}\:\mathrm{capacity}\:\mathrm{c}\:\mathrm{at}\:\mathrm{a}\:\mathrm{temperature}\:\mathrm{of}\:\mathrm{15}°\mathrm{C}\:.\:\mathrm{25\%}\:\mathrm{of}\:\mathrm{the}\:\mathrm{kinetic} \\ $$$$\mathrm{energy}\:\mathrm{of}\:\mathrm{the}\:\mathrm{pellets}\:\mathrm{is}\:\mathrm{converted}\:\mathrm{thermal}\:\mathrm{energy}\:\mathrm{and}\:\mathrm{the}\:\mathrm{plate}\:\mathrm{temperature} \\ $$$$\mathrm{rises}\:\mathrm{to}\:\mathrm{16}°\mathrm{C}.\:\mathrm{The}\:\mathrm{average}\:\mathrm{speed}\:\mathrm{of}\:\mathrm{the}\:\mathrm{pellets}\:\mathrm{before}\:\mathrm{hitting}\:\mathrm{the}\:\mathrm{plate}\:\mathrm{was}\:? \\ $$

Question Number 11737 Answers: 1 Comments: 0

∫ (1/(x(x^n +1))) dx =

$$\int\:\frac{\mathrm{1}}{{x}\left({x}^{{n}} +\mathrm{1}\right)}\:{dx}\:= \\ $$

Question Number 11732 Answers: 1 Comments: 0

0.16 ÷ (2/3) of (2/5) ÷ (1/8)

$$\mathrm{0}.\mathrm{16}\:\boldsymbol{\div}\:\frac{\mathrm{2}}{\mathrm{3}}\:\mathrm{of}\:\frac{\mathrm{2}}{\mathrm{5}}\:\boldsymbol{\div}\:\frac{\mathrm{1}}{\mathrm{8}} \\ $$

Question Number 11714 Answers: 0 Comments: 3

Solve the Crazy equation... x(lnx)^2 +xlnx−1=0

$${Solve}\:{the}\:{Crazy}\:{equation}... \\ $$$${x}\left({lnx}\right)^{\mathrm{2}} +{xlnx}−\mathrm{1}=\mathrm{0} \\ $$

Question Number 11707 Answers: 0 Comments: 0

ax^3 +bx^2 +cx+d=0 pls. solve it in a alzebric way , that a O level(ssc) student can understand...

$$ \\ $$$$ \\ $$$${ax}^{\mathrm{3}} +{bx}^{\mathrm{2}} +{cx}+{d}=\mathrm{0} \\ $$$${pls}.\:{solve}\:{it}\:{in}\:{a}\:{alzebric}\:{way}\:, \\ $$$${that}\:{a}\:{O}\:{level}\left({ssc}\right)\:{student}\:{can} \\ $$$${understand}... \\ $$$$ \\ $$

Question Number 11701 Answers: 2 Comments: 3

If X∝A and X∝B , then why X∝AB ?? Give me the Mathematical Explanation....

$$ \\ $$$$ \\ $$$${If}\:{X}\propto{A}\:\:\:\:{and}\:{X}\propto{B}\:, \\ $$$${then}\:{why}\:{X}\propto{AB}\:?? \\ $$$${Give}\:{me}\:{the}\:{Mathematical} \\ $$$${Explanation}.... \\ $$$$ \\ $$

Question Number 11781 Answers: 3 Comments: 0

sin(2θ) + 7cos(2θ) = 6 find θ

$$\mathrm{sin}\left(\mathrm{2}\theta\right)\:+\:\mathrm{7cos}\left(\mathrm{2}\theta\right)\:=\:\mathrm{6} \\ $$$$\mathrm{find}\:\theta \\ $$

Question Number 11695 Answers: 2 Comments: 4

Question Number 11672 Answers: 2 Comments: 3

8x^3 −6x+1=0 Solves...

$$\mathrm{8}\boldsymbol{\mathrm{x}}^{\mathrm{3}} −\mathrm{6}\boldsymbol{\mathrm{x}}+\mathrm{1}=\mathrm{0} \\ $$$$\boldsymbol{\mathrm{Solves}}... \\ $$

Question Number 11664 Answers: 2 Comments: 1

550÷11=50 And here 5^2 +5^2 +0^2 =50 find another three digit number which is divisible by 11 and the quotient is the sum of the square of the every digit of the dividend. /

$$\mathrm{550}\boldsymbol{\div}\mathrm{11}=\mathrm{50}\:{And}\:{here}\:\mathrm{5}^{\mathrm{2}} +\mathrm{5}^{\mathrm{2}} +\mathrm{0}^{\mathrm{2}} =\mathrm{50} \\ $$$${find}\:{another}\:{three}\:{digit}\:{number} \\ $$$${which}\:{is}\:{divisible}\:{by}\:\mathrm{11}\:{and}\:{the} \\ $$$${quotient}\:{is}\:{the}\:{sum}\:{of}\:{the}\: \\ $$$$\:{square}\:{of}\:\:{the}\:{every}\:{digit}\:{of}\: \\ $$$${the}\:{dividend}. \\ $$$$ \\ $$$$/ \\ $$

Question Number 11661 Answers: 1 Comments: 0

8x^3 −6x+1=0. Solves... equation x_1 =? x_2 =?

$$\mathrm{8}\boldsymbol{\mathrm{x}}^{\mathrm{3}} −\mathrm{6}\boldsymbol{\mathrm{x}}+\mathrm{1}=\mathrm{0}. \\ $$$$\boldsymbol{\mathrm{Solves}}...\:\:\boldsymbol{\mathrm{equation}} \\ $$$$\boldsymbol{\mathrm{x}}_{\mathrm{1}} =?\:\:\:\:\:\boldsymbol{\mathrm{x}}_{\mathrm{2}} =? \\ $$

Question Number 11660 Answers: 0 Comments: 0

Evaluate ∫x^x dx

$$ \\ $$$$ \\ $$$$ \\ $$$$\:\:\:{Evaluate}\:\:\int{x}^{{x}} {dx} \\ $$$$ \\ $$$$ \\ $$$$ \\ $$

Question Number 11653 Answers: 0 Comments: 0

Can you give me some problem from your calculus text book...

$${Can}\:{you}\:{give}\:{me}\:{some}\:{problem} \\ $$$${from}\:{your}\:{calculus}\:{text}\:{book}... \\ $$$$ \\ $$

Question Number 11648 Answers: 1 Comments: 0

∣x∣<l Σ_(n=1) ^∞ x^n =?

$$\mid\mathrm{x}\mid<\mathrm{l} \\ $$$$\underset{\mathrm{n}=\mathrm{1}} {\overset{\infty} {\sum}}\mathrm{x}^{\mathrm{n}} =? \\ $$

Question Number 11633 Answers: 1 Comments: 0

A geometric sequence with n terms a_1 , a_2 , a_3 , ..., a_n which has a_1 . a_n = 3 If the product of all n terms = a_1 a_2 a_3 ...a_n = 59049 Determine the value of n

$$\mathrm{A}\:\mathrm{geometric}\:\mathrm{sequence}\:\mathrm{with}\:{n}\:\mathrm{terms}\: \\ $$$${a}_{\mathrm{1}} ,\:{a}_{\mathrm{2}} ,\:{a}_{\mathrm{3}} ,\:...,\:{a}_{{n}} \:\mathrm{which}\:\mathrm{has}\:{a}_{\mathrm{1}} \:.\:{a}_{{n}} \:=\:\mathrm{3} \\ $$$$\mathrm{If}\:\mathrm{the}\:\mathrm{product}\:\mathrm{of}\:\mathrm{all}\:{n}\:\mathrm{terms}\:=\:{a}_{\mathrm{1}} {a}_{\mathrm{2}} {a}_{\mathrm{3}} ...{a}_{{n}} =\:\mathrm{59049} \\ $$$$\mathrm{Determine}\:\mathrm{the}\:\mathrm{value}\:\mathrm{of}\:{n} \\ $$

Question Number 11632 Answers: 1 Comments: 0

Question Number 11628 Answers: 1 Comments: 0

p(x−1)+p(x+1)=4x^2 −2x+10 p(x)=?

$$\mathrm{p}\left(\mathrm{x}−\mathrm{1}\right)+\mathrm{p}\left(\mathrm{x}+\mathrm{1}\right)=\mathrm{4x}^{\mathrm{2}} −\mathrm{2x}+\mathrm{10} \\ $$$$\mathrm{p}\left(\mathrm{x}\right)=? \\ $$

Question Number 11621 Answers: 1 Comments: 0

Evaluate ∫((ax+b)/(cx+d))dx

$${Evaluate}\:\:\int\frac{{ax}+{b}}{{cx}+{d}}{dx} \\ $$

Question Number 11619 Answers: 1 Comments: 1

Evaluate ∫(dx/((x+a)(x+b)))

$${Evaluate}\:\int\frac{{dx}}{\left({x}+{a}\right)\left({x}+{b}\right)} \\ $$

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