Saturday

October 25, 2014

October 25, 2014

Total # Posts: 1,743

**Math**

(3/5)*x-6*x=4 (3/5)*x-6*x=4 3/5=0.6 0.6*x-6*x=4 0.6*x-6*x=4 -5.4*x=4 Divide with -5.4 x=4/(-5.4) 4/(-5.4)=40(-54) x=40/(-54) Factorization of numbers 40 and 54 40=2*2*2*5 54=2*3*3*3 x=40/(-54) x=(2*2*2*5)/(-2*3*3*3) x=(2*2*5)/(-3*3*3) x=20/(-27) x= -0,...
*February 7, 2011*

**math**

6*10^9=6*10*10*10*10*10*10*10*10*10
*February 7, 2011*

**math**

3*10^6=3*10*10*10*10*10*10=3000000= 3 milions
*February 7, 2011*

**math**

2cm of scale=25km Divide wit25 1km=2/25=0,08cm of scale 145*0,08=11.6cm 80*0,08=6.4 cm
*February 7, 2011*

**math**

3(x-2)+12(x+8)= 3*x-3*2+12*x+12*8= 3x-6+12x+96= 15x+90 3(x-2)+12(x+8)=15x+90
*February 7, 2011*

**math**

1/6=2/12 (9/12)+(1/6)=(9/12)+(2/12)= 11/12 less then 1
*February 7, 2011*

**math**

30>-6(5-x) 30> -30+6x 30+30>6x 60>6x Divide with 6 10>x x<10
*February 5, 2011*

**math**

In google type: "function graphs online" When you see list buf results click on: rechneronline.de/function-graphs/ When page be open in blue rectacangle type your function and click otion Draw
*February 4, 2011*

**math**

In google type: "function graphs online" When you see list buf results click on: rechneronline.de/function-graphs/ When page be open in blue rectacangle type: x+7 in grey rectacangle click: 2*x-5 In Display properties set: Range x-axis -20 to 20 and Range y-axis -20 ...
*February 4, 2011*

**math**

In en.wikipedia type: "Half-life" and read text, and retype formulas. So: N(t)=N0*e^(-lambda*t) N(t)=N(17)=3 N0=10 t=17 3=10*e^(-lambda*17) Divide with 10 3/10=e^(-lambda*17) e^(-lambda*17)=3/10 -lambda*17=ln(3/10)Divide with 17 -lamba=ln(0.3)/17 lamda=-ln(0.3)/17 ...
*February 3, 2011*

**math**

22-2*[5+3(6-1)]= 22-2*[5+3*5]= 22-2*(5+15)= 22-2*20= 22-40= -18
*February 2, 2011*

**math**

100 m = (1/4)*400 m 1 min=60 sec 60*1/4= 15 sec
*January 30, 2011*

**Math(Please check)**

f'(x)=7 for all values of x
*January 30, 2011*

**Applied Business Math/Colleg student**

(2/3)=(2*4)(3*4)=(8/12) (1/6)=(2*1)/(2*6)=(2/12) 2/3+1/6+11/12= =(8/12)+(2/12)+(11/12) =(21/12) =(12+9)/12 =(12/12)+(9/12) =1+(3*3)/(3*4) = 1 3/4 =(4/4)+(3/4) =7/4
*January 29, 2011*

**Math**

The most useful form of straight-line equations is the "slope-intercept" form: y = mx + b m is the slope and "b" gives the y-intercept. 3x-5y=8 -5y=8-3x Divide with -5 y=(-8/5)+(3x/5) y=(3/5)x-8/5 The other format for straight-line equations is called the &...
*January 27, 2011*

**math**

In google type: "quadratic equation online" When you see list of result click on: webgraphingcom/quadraticequation_quadraticformula.jsp When this page be open in rectacangle type: x^2-x-2=0 and click option solve it! You will see solutions of this equation Step-by-...
*January 27, 2011*

**Math**

5=20/4 (2/3)q+(20/4)=(3/4) (2/3)q=(3/4)-(20/4) (2/3)q= -17/*4 Multiply with 4 (8/3)q= -17 Multiply with 3 8q= -17*3 8q= -51 Divide with 8 q= -51/8
*January 27, 2011*

**math/science**

48km=48000m 3/48000=1/16000 h 1h=3600 sec (1/16000)*3600=3600/16000= 0.225 sec
*January 27, 2011*

**math**

The common distance of the points of a circle from its centre is called its radius. Diametar=2*Radius go to en.wikipedia and type circle in search field.
*January 25, 2011*

**math**

1 hour=60 min=4*15 min half hour=30min=2*15 min 4+2=6 6*1=6 miles
*January 25, 2011*

**math**

1 foot=12 in (1 foot)^2 =(12 in)^2 1square foot = 144square inchs
*January 25, 2011*

**math**

(3/2 )/(4/5)=(3*5)/(2*4)=15/8 (1/2)*(1/2)=1/4=2/8 (15/8)+(2/8)=17/8=(16+1)/8=(16/8)+(1/8)= 2 1/8
*January 25, 2011*

**Math**

Subtract 8 of each numbers 64-8=56 56-8=48 48-8=40 40-8=32 Pattern: 64,56,48,40,32
*January 25, 2011*

**math**

2*10+2*100+0.4=20+200+0.4=220.4
*January 25, 2011*

**Math Algebra**

2m+3n=4 2m+3*2=4 2m+6=4 2m=4-6 2m= -2 Divide with 2 m= -1 n=2 m= -1 2m +3n=4 Check of results: 2m+3n=4 2*( -1)+3*2=-2+6=4 -m+2n=5 -( -1)+2*2=1+4=5
*January 25, 2011*

**Math**

The most useful form of straight-line equations is the "slope-intercept" form: y = mx + b m is the slope and "b" gives the y-intercept. The other format for straight-line equations is called the "point-slope" form. For this one, they give you a ...
*January 24, 2011*

**Math (Calculus AB)**

The slope of tangent line is first derivation of function. slope=dy/dx If you don't know how to find Derivation in Google type: "calc101" When you see list of results click on: calc101com When page be open click option: derivatives In rectacangle type: x*cos[x] (...
*January 24, 2011*

**math**

5/7=(8*5)/(8*7)=40/56 6/8=(7*6)/(7*8)=42/56 30/56 < 40/56 30/56 < 42/56
*January 22, 2011*

**Math**

On: rechneronline.de/function-graphs/ In Dispay properties type follow values: Range x-axis from -6.28 to 6.28 Range y-axis from -5.5 to 1.5
*January 22, 2011*

**Math**

I suppose that 90 in your first equation is 90° 90°=(pi/2) radians y+3= 2sin(3x +90°) y=2sin(3x +90°)-3 y=2sin(3x +90°)-3 Angle in degres y= 2sin(3x +pi/2)-3 Angle in radians In google type: "function graphs on line" When you see list of results ...
*January 22, 2011*

**Math**

3/6=1/2 7sqrt(3/6)=7sqrt(1/2)=7/sqrt(2)
*January 22, 2011*

**Math**

8/9=20/x 8x=20*9 8x=180 Divide with 8 x=180/8 x=(2*2*45)/(2*2*2)=45/2=22.5
*January 22, 2011*

**math**

sin(A)=cos(90°-A) cos(33°)=sin(90°-33°)=sin(57°)
*January 21, 2011*

**math**

In google type: "quadratic equation online" When you see list of result click on: webgraphingcom/quadraticequation_quadraticformula.jsp When this page be open in rectacangle type equation: 3a^2+6a-189=0 and click option solve it! You will see solutions of this ...
*January 20, 2011*

**math**

Fist number= a Second number= a+1 Third number= a+2 a^2+(a+1)^2+(a+2)^2=194 (a+1)^2=a^2+2*a*1+1^2=a^2+2a+1 (a+2)^2=a^2*2a*2+2^2=a^2+4a+4 a^2+a^2+2a+1+a^2+4a+4=194 3a^2+6a+1+4=194 3a^2+6a+5-194=0 3a^2+6a-189=0 The exactsolutions of this equation are: a=7 and a=-9 Solution: ...
*January 20, 2011*

**math**

0<x<15cm x= larger of 0 and lesser of 15cm
*January 20, 2011*

**Math/Trig**

L=r*aplha alpha in radians L=7.7 alpha=pi/7 7.7=r*(pi/7) divide with (pi/7) r=7.7/(pi/7) r=(7.7*7)/pi r=53.9/3.1415926535 r=17,1569cm r=17.2cm
*January 20, 2011*

**math**

7/7=1
*January 20, 2011*

**math help please!!**

log(x-2)= 1-log(x+1) log(x-2)+log(x+1)=1 log(a)+log(b)=log(a*b) log(x-2)+log(x+1)=log((x-2)*(x-1)) 1=log(10) log((x-2)*(x-1))=log(10) So: (x-2)*(x+1)=10 x^2-2x+x-2=10 x^2-x-2=10 x^2-x-2-10=0 x^2-x-12=0 Exact solutions of this equation is: -3 and 4 Negative numbers have not ...
*January 20, 2011*

**math log**

Third row have typefeler Correct formula is: log(a+b)=log(a)+log(b)
*January 20, 2011*

**math log**

7.2=36/5 36=6*6 log(a+b=log(a)+log(b) log(36)=log(6)+log(6)=2*log(6) log(a/b)=log(a)-log(b) log(36/5)=2*log(6)-log(5) log(6)=m log(5)=n log(36/5)=log(7.2)=2m-n
*January 20, 2011*

**college math 209**

In google type "quadratic equation online" when you see list of results click on: webgraphingcom/quadraticequation_quadraticformula.jsp Whenn this page be open in rectacangle type your equation,and click option solve it and you will see solution Step-by-step
*January 16, 2011*

**college math 209**

In google type "quadratic equation online" when you see list of results click on: webgraphingcom/quadraticequation_quadraticformula.jsp When this page be open in rectacangle type your equation,and click option solve it You will see solution Step-by-step
*January 16, 2011*

**Math/Trigonometry**

1 revolution=2*pi radians 1.6*2*3.1415926535=10,0530964912 radians nearest tenth=10 radians
*January 14, 2011*

**Math/Trig**

Area of circle: A=r^2*pi Area of your sector=r^2*pi*(125/360)=3^2*pi*125/360=9*pi*125/360 =9*3.1415926535*125/360 =3534,2917351875/360 =9,8174770421875 m^2
*January 14, 2011*

**math**

In google type "functions graphs online" When you see list of results click on: rechneronline.de/function-graphs/ When page be open type your fuction and click option Draw
*January 14, 2011*

**11th grade math**

Go to: en wikipedia org And type:Absolute value You will see everything about Asolute Value including graph.
*January 13, 2011*

**math**

In google type "composite numbers " When you see list of results click on en.wikipedia and you can find everything about composite numbers
*January 12, 2011*

**math**

1+4+s= 5+s
*January 12, 2011*

**math**

-3(3x+15)-(10+x)=35 -9x-3*15-10-x=35 -9x-45-10-x=35 -10x-55=35 -10x=35+55 -10x=90 x=90/(-10) x=-9
*January 12, 2011*

**math**

Standard notation is just the number like 248 or 822 or.... and so on, or it is a number completely written out without any shortcuts.
*January 12, 2011*

**integrated math**

y=210-6b
*January 10, 2011*

**math**

In mathematics, an irrational number is any real number which cannot be expressed as a fraction a/b 30=2*3*5 sqroot(30)=sqroot(2)*sqroot(3)*sqroot(5) sqroot(2), sqroot(3) and sqroot(5) is irrational numbers. sqroot(30) is irrational too. The real numbers are the numbers that ...
*January 10, 2011*

**Math**

2*log(x)-log(4)-log(3)+log(x)=2logx+logx-log4-log3 =3*log(x)-[log(4)+log(3)] log(x^n)=n*log(x) 3*log(x)=log(x^3) log(a)+log(b)=log(a*b) log(4)+log(3)=log(4*3)=log(12) log(a)-log(b)=log(a/b) 3*log(x)-[log(4)+log(3)]=log[(x^3)/12]
*January 10, 2011*

**math**

|60| = 60 |-60| = 60 60-60=0
*January 10, 2011*

**math**

You also can write fraction: 3.9/1.2=x/500 1.2*x=3.9*500 1.2*x=1950 Divide with 1.2 x=1950/1.2 x=1625
*January 8, 2011*

**math**

copper/nickel=3.9/1.2=3.25 500*3.25=1625 kg of copper
*January 8, 2011*

**Math**

7/20=(7*5)/(20*5)=35/100=0.35
*January 7, 2011*

**math**

1meter=100 centimeters=10^2 centimeters 1m=10^2cm 1m^3=(10^2)^3=10^6 cm^3=1000000 cm^3 1kilometer=1000meters=10^3 meters 1km^2=(10^3)^2=10^6 cm^2=1000000 cm^2
*January 6, 2011*

**math**

1meter=100cm=10^2cm 1m^3=(10^2)^3=10^6 cm^3=1000000 cm^3
*January 6, 2011*

**math**

1 liter= 1cubic decimeter 1dm= 10cm 1dm=10^2cm 1L=1dm^3=(10^2)^3=10^6 cm^3=1000000 cm^3 2L=2*10^6 cm^3=2000000 cm^3 One litre of water has a mass of one kilogram. Two litre of water has a mass of 2 kilograms.
*January 6, 2011*

**Math (algebra)**

(y-1)/2u+x=m (y-1)/2u=m-x y-1=2u*(m-x) Divide with (m-x) 2u=(y-1)/(m-x) Divide with 2 u=(y-1)/[2*(m-x)]
*January 6, 2011*

**Math 3**

11*13=143 6/11=(6*13)/143=78/143 2/13=(2*11)/143=22/143 6/11+2/13=(78/143)+(22/143)=100/143
*January 6, 2011*

**math**

8.7
*January 2, 2011*

**8th grade math**

3x+3y=-6 3y=-6-3x Divide with 3 y=-2-x 7x+4y=1 7x+4*(-2-x)=1 7x-8-4x=1 3x-8=1 3x=1+8 3x=9 Divide with 3 x=9/3 x=3 y=-2-x y=-2-3 y=-5 x=3 y=-5 Cheking of results: 3x+3y=3*3+3*(-5)=9-15=-6 7x+4y=7*3+4*(-5)=21-20=1
*December 21, 2010*

**math**

x+5y=-4 y=3x-4 x+5*(3x-4)=-4 x+15x-20=-4 16x=-4+20 16x=16 Divide wth 16 x=1 y=3x-4 y=3*1-4 y=3-4=-1 x=1 y=-1 Cheking of result: y=3x-4 -1=3*1-4 -1=3-4 -1=-1 x+5y=-4 1+5*(-1)=-4 1-5=-4 -4=-4
*December 21, 2010*

**art**

Go to images.google com and type scgraffito any you can see some examples.
*December 21, 2010*

**Math Problem Solving**

6n+(8n-2n)+3/2=6n+8n-2n+3/2 6n+8n-2n=14n-2n=12n 6n+8n-2n+3/2=12n+(3/2)
*December 21, 2010*

**math**

A=(1/2)*a*h A=255 - Area h=15 - hight a - lenght of base 255=(1/2)*a*15 Multiply with 2 510=15*a Divide with 15 a=510/15=34 a=34ft Checking of results: A=(1/2)*a*h A=(1/2)*34*15 A=(1/2)*510 A=255ft squared
*December 21, 2010*

**math**

x+9-6=7 x+3=7 x=7-3 x=4
*December 21, 2010*

**MAth**

If your solution x=315 you solve it correctly.
*December 18, 2010*

**Math**

A secant line of a curve is a line that (locally) intersects two points on the curve. You must know equation of curve f(x) if you want to find secant line.
*December 18, 2010*

**math**

liter is unit of volume not of force
*December 18, 2010*

**math**

1cm=(1/100)m 1m=100cm 100m=100*100=10000cm
*December 17, 2010*

**MATH**

-7+2=-5 |-5|=5 |-4|=4 5-4=1
*December 15, 2010*

**Math**

In google type: "quadratic equation online " When you see results clik on webgraphingcom/quadraticequation_quadraticformula.jsp type you equation and click solve it and you will see solution step by step.
*December 15, 2010*

**Aims math [help please very appreciated]**

15x-2x=21-4 13x=17 Divide wit 13 x=17/13
*December 15, 2010*

**5th math**

(1/4)*(2/2)=2/8 (1/4)=(2/8) (1/4)+(1/8)= (2/8)+(1/8) =3/8
*December 15, 2010*

**math**

2x^2 -12x +23=2*(x^2-6x+23/2) (x-a)^2= x^2-2ax+a^2 (x-3)^2= x^2-2*3*x+3^2= x^2-6x+3^2 2*(x^2-6x+23/2)= =2*(x^2-2*3*x +3^2+ 23/2 -3^2) =2(x^2-6x+3^2)+2*(23/2)-2*(3^2) =2*(x-3)^2+23-2*9 =2*(x-3)^2+23-18 =2*(x-3)^2 +5 Proof: 2*(x-3)^2+5=2*(x^2-2*3*x+3^2)+5 =2*(x^2-6x+9)+5 =2x^2-...
*December 10, 2010*

**math**

sqroot(5*1215)=sqroot(6075)=77.9423
*December 9, 2010*

**Math**

2/3=0.66666666 7/11=0.6363636 Larger is 0.67
*December 6, 2010*

**Math**

a=first number b=second number a+b=44 b=5+2a a+b=a+5+2a =3a+5= 44 3a+5=44 3a=44-5 3a=39 Divided with 3 3a/3=39/3 a=13 b=5+2a b=5+2*13 b=5+26 b=31 a+b=13+31=44
*December 6, 2010*

**math**

(ã2y*ã8y*ã3=ã(2*8*y^2)*ã3=ã(16*y^2)*ã3 =-4y*ã3 OR =4y*ã3 Becouse ã16= -4 OR 4 and ãy^2=y
*December 5, 2010*

**Math**

x^2+5x-3x-15=9 x^2+2x=9+15 x^2+2x=24 x^2+2x+1=24+1 (x+1)^2=25 Becouse: (x+1)^2=x^2+2x+1 x+1=sqroot(25) x+1=5 and x+1=-5 x+1=5 x=5-1=4 x+1=-5 x=-5-1=-6 Solutions is: x=4 and x=-6
*December 4, 2010*

**Math**

a=shorter leg b=longer leg c=hypotenuse a=b-14 c^2=a^2+b^2 26^2=(b-14)^2+b^2 676=b^2-2*b*14+14^2+b^2 676=2b^2-28b+196 676-196=2(b^2-14b) 480=2(b^2-14b) Divide with 2 240=b^2-14b b^2-14b=240 b^2-14b+7^2=240+7^2 Becouse: (b-7)^2=b^2-14b+7^2 (b-7)^2=240+49 (b-7)^2=289 b-7=sqroot(...
*December 4, 2010*

**math**

3x^2+11x+5=15 3x^2+11x+5-15=0 3x^2+11x-10=0 ax^2+bx+c=0 a=3 , b=11 , c=-10 In google type "square equation online" and select some site.
*December 1, 2010*

**Math**

71%=71/100=0.71 510*0.71=362.1 million square kilometers
*November 30, 2010*

**math**

Area=a*b A=a*b=12 Area=12 12=a*b Divide with b 12/b=a a=12/b Perimeter=2*a+2*b P=25 25=2*(12/b)+2*b 25=(24/b)+2*b Mulitiple with b 25b=24+2*b^2 Solutions of this equation is: b=[sqroot(433)]/4+(25/4) =5.202163 +6.25=11.452163 a=12/b=(12/11.452163)=1.047837 a=1.047837 b=11....
*November 29, 2010*

**math**

The angles of a parallelogram satisfy the identities: A=C B=D A+B=180° A+B+C+D=360°. C=A=(2x+25) D=B=(3x-5) A+B=180° 2x+25+3x-5=180° 5x+20°=180° 5x=180°-20° 5x=160° x=160°/5 x=32° A=C=(2x+25°)=2*32°+25°=64°+25°=89...
*November 25, 2010*

**math**

33=3*11 65=5*13 33/65=(3*11)/(5*13)
*November 23, 2010*

**Math**

18=2*3*3 24=2*2*2*3 18/24=(2*3*3)/(2*2*2*3)=3/(2*2)=3/4 9=3*3 12=2*2*3 9/12=(3*3)/(2*2*3)=3/(2*2)=3/4 15=3*5 20=2*2*5 15/20=(3*5)/(2*2*5)=3/(2*2)=3/4 6=2*3 9=3*3 6/9=(2*3)/(3*3)=2/3
*November 21, 2010*

**math**

C=d*pi= 200*pi= 200*3.14= 628 meters
*November 21, 2010*

**Algebra**

-y=4-3x Multiply with(-1) y=3x+4 (Slope=3) Remember, any two perpendicular lines are negative reciprocals of each other. So if you're given the slope of 3, you can find the perpendicular slope by this formula: mp=(-1)/m where: m-slope of line y=3x+4 mp is the perpendicular...
*November 21, 2010*

**Math**

F-lenght of first size S-lenght of second size T-lenght of third size S=F+3 T=(4/5)*F F+S+T=F+F+3+(4/5)F=384 2F+3+(4/5)F=384 2F+(4/5)F=384-3 2F+(4/5)F=381 Multiply with 5 10F+4F=381*5 14F=1905 Divide with 14 F=1905/14 S=F+3=(1905/14)+(42/14) Becouse (42/14)=3 S=1947/14 T=(4/5...
*November 21, 2010*

**6th grade Math**

11-7=4 4/11 not red
*November 20, 2010*

**Math**

s=v^1/3=third root(v) s=third root(729)=9
*November 20, 2010*

**Math**

a1=34-9*d Becouse nth member in arithmetic progression is: an=a1+(n-1)*d a10=a1+(10-1)*d a10=a1+9*d a10-9*d=a1 a a1=a10-9*d a1=34-9*d an=a1+(n-1)*d a25=a1+(25-1)*d a25=a1+24*d a25=7+24*3 a25=7+72=79
*November 19, 2010*

**Math**

The sum of members of a arithmetic progression is: Sn=(n/2)*[2a1+(n-1)*d] a1-first number in arithmetic progression d-common difference of successive members n-numbers of members In this case: n=20 , (n/2)=10 , n-1=19 a1=a10-9*d a1=34-9*d Sn=(n/2)*[2a1+(n-1)*d] =10*[2*(34-9*d...
*November 19, 2010*

**Algebra**

z-5-7(z-3)+3(5z+1)=z-5-7z+21+15z+3 =9z+19
*November 19, 2010*

**math**

50/20=2.5lb
*November 19, 2010*

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