Alan

unknow:

A group of 8 friends (5 girls and 3 boys) plans to watch a movie, but they have only 5 tickets. If they randomly decide who will watch the movie, what is the probability that there are at least 3 girls in the group that watch the movie?

reinout-g:

Alan:

hiii:

which is greater: .06 or 60%. and how do you show that on a number line?

60% is 60/100 which is 0.06, so they are the same thing.

Actually 60/100 = 0.6, which is ten times as big as 0.06.

therefore, 60% is bigger

helpneeded105:

What two numbers multiply to 600, and add to 17?

The way to approach these problems is to let the two numbers be called a and b (or any other two letters you like!). Then you write
a + b = 17
a*b = 600

Rearrange the first to get b = 17 - a by subtracting a from both sides. Substitute this into the second to get a*(17 - a) = 600.
This can be written as 17a - a² = 600, which can be rearranged as:
a² - 17a + 600 = 0.
This is a quadratic equation that can be solved to find two values for a.
However, neither value exists on the real number line; they are what are called complex numbers.
Unless you've dealt with complex numbers it's best not to take this any further here!
If you made a mistake with the 600, and meant 60, then the quadratic factorises nicely into two real positive integers.


Original problem:
30+17a-20a^2

babynannay16:

where is the negative sign? it is not on the caculator

notgoodatmath:

in a equation how do u get the x value if you have the y value?

hiii:

which is greater: .06 or 60%. and how do you show that on a number line?

loly:

BEDMAS QUESTION... 52 x 2 / 13 + 5 = ???

mess-mate:

...forgot the eq.

h = 20t − 4.9t2

mess-mate:

Thanks for the quick reply, Alan.
I want for ex. a plot on the x-axis from 0 to 5 and on the y-axis from 0 to 8.
No neg. x or y.