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

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.