Headingnorth

I´m not sure how to explain it but I´ll give you my solution:

(c+1)/(c^2-1)-(c+1)/(1-c)=

= 1/(c-1) - (c+1)/(1-c)                                                              (conjugates)

= (1-c)/(c-1)(1-c)  - (c+1)(c-1)/(c-1)(1-c)                                 (common denominators)

= (1-c)+(-(c-1)(c+1))/ -(c-1)(c-1)                                               the red text is replaced with 1 due to divison

= (1+ c+1)/(c-1)

=(c+2)/(c-1)     

VSB

Good luck, if i have been unclear about something, ask me or someone else here:)

Yes the firs one is right so just add them:)

First divide both sides with 1000

so now it is e^(.05X)=0,001

now use the ln (the natural logarithm) on both sides

ln e^(0,5X)=ln0,001

0,5X=ln0,001

X=(ln0,001)/0,5

X=2 (ln0,001)

good luck

Look at this, 

Let c = (x1,y1) and d = (x2,y2)

c+d = (x1+x2,y1+y2) 

λ(x,y)= (λx,λy) where λ is any number

and as always the multiplication will be executed before addition. 

Good luck and please ask again if you didn't get it:))

V=B*h 

where B is the area of the bottom and h is the height. i assume you know how to calculate the volume. but maybe have some problems with the fractions. 

for example you can do like this. 

 2 and 2 over 3.= 2+ (2/3)  1=(3/3) -----> 2= (6/3) ------> 2+(2/3)= (6/3)+(2/3)= 8/3

try to do the other two sides by yourself.

Then you just have to multiply the three different numbers to get the volume.

an example of that. (8/3)*(3/5)*(1/2) = 24/30 = 4/5

i hope you follow 

good luck 

ok, Im not totally sure about this.

but...

a rational number is a integer number or a fraction of two integers.

an irrational number is a number that can not be written as a fraction. (pi, sqrt(2), e for example)

therefore, when you multiply an irrational number with a rational number it has to be irrational (if the rational number isn´t zero)

for example multiplie pi with 1/4 the result is pi/4 but since you can´t write pi as a fraction you can´t write pi/4 as a fraction.

a=angle

h=hypotenuse

m=the height

sin(a)=m/h  -------->m=h*sin(a)

Good luck!

I don´t get it:/

Do you need to use all four operations (times, divide....) and all numbers?

$${\mathtt{V}} = {\frac{\left({\mathtt{\pi}}{\mathtt{\,\times\,}}{{\mathtt{r}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{\mathtt{h}}\right)}{{\mathtt{3}}}}$$

r=radiús

h=height

you can write everything in seconds as well.

1h=60*60sek=3600sek

1min=60sek

so 1:32:20=1*3600+32*60+20=5540sek

1:44:30=1*3600+44*60+30=6270sek

in total 5540+6270=11810sek

then you go backwars and figure out how many whole ours you got and then minutes and the seconds.

you can also switch the numbers into sexagesimal numbers but that seems a bit overkill in this case.

Try this:

first you add the hours. ---> 1+1=2

now add the minutes ---> 32+44=76 min (60 min in one hour gives us 76= 1hour +16 min)

now we can add the seconds---> 30+20=50 (not a whole minute)

in total: 2h+1h+16min+50 sek

3:16:50

$$V=(pi*r^2*h)/3$$

$$V=(pi*(30/2)^2*36)/3=8482.3$$

the price for one student (if they are four)=$18,50

one ticket cost (if they´re five)=$80/5=$16.00    since five tickets cost $80

so each student saves $2.50 if they find a fifth one.

y=43.5

y=-18(sin(pi/6))(x-1)

sin(pi/6)=0,5 -----> 43,5=-9(x-1)

                               43,5=-9x+9
                               43,5-9=-9x
                                       x=34,5/9=3.8

I´m not sure if I did the equation as you wanted it or if you ment y=-18sin((pi/6)*(x-1))

sounds more reasonable:)

thanks:)

Hey!!!

I´m not totally sure about this but I think it make sense :/

We can pick 3 girls out of 12 in 12*11*10 ways.

(first we can choose from 12 girls, when we picked one we got 11 to choose from and so on...)

In the same way of thinking we can pick 3 boys in 10*9*8 different ways.

then we multiplie the numbers of different ways to combine the girls with the number of different ways to combine the boys.

so we got (12*11*10)*(10*9*8)

Use the 2nd button in the upper left corner. Then tap acos

acos=cos^-1

Maybe I´m not qualified for answering your question and maybe I don´t understand english properly so don´t trust me completly

...but isn´t there just to put the numbers into the formula and use different values for t?

8 values means 8 different times. as a suggestion every half second to start with.