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+3146

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tom:
The equation
X*X*X-X=45
has a solution between 3 and 4
use a trial and improvement method to find this solution
give your solution correct to 1 decimal place
you must show all you working

step 1:
X=3
X*X*X-X = X^3-3 = 3^3-3 = 24

step2:
X=4
X*X*X-X = X^3-4 = 4^3-4 = 60

step3: (left=3, right=4)
middle = (left+right)/2 = (3+4)/2 = 7/2 = 3.5
X*X*X-X = 3.5^3-3.5 = 39.375
here you see, that the right side of the equation 45 is between 39.375 and 60. so the X is between middle and right (3.5 and 4) and not between (3 and 3.5).

step4: (left=3.5, right=4)
middle = (left+right)/2 = (3.5+4)/2 = 3.75
X*X*X-X = 3.75^3-3.75 = 48.984375
so X is between left and middle.

step5: (left=3.5, right=3.75)
and so on...

[input]X*X*X-X=45[/input]

adminMar 1, 2012

+3146

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AntVenom:
Show that a 5% increase followed by a 5% increase is larger than a 10% increase.

This was my homework and I don't really get it. Could someone help me please?!

5%+5%

for example if you want to calculate: 1+5%+5%
X+<percent value> = X*(1+<percent value>/100)

1*(1+5%)*(1+5%)
(1*(1+5/100))*(1+5/100)
1*1.05*1.05
1*1.1025
and that's 10.25% > 10%

adminMar 1, 2012

0

16 x 5 = 80 ;
80-76=4

answer - 5 games

GuestMar 1, 2012

0

Sorry,

the second one is:

y=6e^sqrt(4+x^2)*x^3

Thank you!

GuestMar 1, 2012

+3146

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[input]2/3y-6=2[/input]

adminMar 1, 2012

+3146

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chhhfxst:
what is 32!

[input]32![/input]

adminMar 1, 2012

+3146

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10^-3 = 1/(10^3) = 0.001

adminMar 1, 2012

+3146

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[input]50 * 3.5%[/input]

adminMar 1, 2012

0

well hi,
can u explain abit elaborately????
coz my answers are'nt matching with the options!!!

GuestMar 1, 2012

0

surface area is 2ab+2bc+2ac
after you find the area's for both doors - should be (64) for the 7 foot door and (56) for the 6 foot door. now you find the difference, 64-56=9
9ft difference

GuestMar 1, 2012

0

i don't really understand your question because which side is the leg on?
anyway, if the leg (19.2) is adjacent to the angle (46), then you'd use cos
so the equation should be: cos(46 degrees)=19.2/x
x=AC
but if the leg is opposite of the given angle, then you'd use sin
sin(46 degrees)=19.2/x
plus, you could use sin and cos reciprocals - sec and csc

just remember SOHCAHTOA

GuestMar 1, 2012

0

GuestMar 1, 2012

Feb 29, 2012

0

GuestFeb 29, 2012

+6

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FitzFeb 29, 2012

+6

0

FitzFeb 29, 2012

+6

0

FitzFeb 29, 2012

0

GuestFeb 29, 2012

0

jumakhangulzari IS WRONG!

ALWAYS remember PEMDAS!!!
-4+1/25+99/25
-4+1/25+3.96
-3.75+3.96
.21=X!!!

-FITZ-

GuestFeb 29, 2012

0

-4+1/25+99/25=
-4+1+99/25
-4+100/25
-4+4=O

=0

GuestFeb 29, 2012

+3146

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[input]nCr( 16, 2 )[/input]

adminFeb 29, 2012

+3146

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adam:
(x-3)(x+5)

(x-3)(x+5) = x*x +5*x -3x -3*5

juskruzm:
x^2+2x-15

adminFeb 29, 2012

+3146

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hjk:
ein dreieck hat die winkel alpha=30° und gamma=40° . Wie sind die übrigen Maße?

beta = 180° - 30° - 40°

adminFeb 29, 2012

0

FOIL
F(irst) O(uter) I(nner) L(ast)

x^2+2x-15

GuestFeb 29, 2012

0

sec=1/cos
cos45(degrees)=1/sqrt of 2
sec45(degrees)=1/cos45(degrees)=1/ 1/sqrt of 2=sqrt of 2
so for calc purposes, find sec72(degrees)
you would enter 1 divided by cos72(degrees) to find your answer

GuestFeb 29, 2012

0

you mean like converting it into decimals???
100%=1
90%=0.9
80%=0.8
...
so to find 80% of 71, 71 x 0.8=56.8

GuestFeb 29, 2012

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