Now THAT's a problem !
Lemme at it ! Outa my way !
The probability of picking two of the friends to work together is
(the number of pairs of friends there are)
divided by
(the total number of pairs that can be pulled out of 21 students).
The number of pairs of friends there are is (3 x 2) / 2 = 3 pairs.
The total number of pairs that can be selected out of 21 students is
(21 x 20) / 2 = 210 pairs.
The probability that the pair selected will be two of the friends is
3 / 210 = 1/70 = about 1.43 % (rounded)
3. 8(3+8)
Explanation : 8x3 = 24 + 8x8 =64 which is congruent to 24 +64
<span>ets say in this case x is the amount or rainfall in inches on a given day. We imagine that the ground around the lake absorbs some amount of rainfall. When rainfall is less than this the lake level does not go up. Lets say that rainfall level is 1 inch so we want the polynomial to equal zero for x = 1 and to increase after that.
The polynomial y (water level) = (x-1)(x+1) has a solution y = 0 at x = 1 and is an upward facing parabola so that as x increases so does y. negative values of rainfall have no meaning so we are interested only in the polynomial when x is GT zero.
x=0 y=-1 lake level drops one inch a day without rain
x=1 y=0 one inch of rain and water level stays constant
x=2 y = 3 two inches of rain and water level goes up 3 inches</span>
8 per package.
64*2= 128
Now we need to divide 128 by 8 to see how many packages we will need.
128/8= 16
Now we know that we need 16 packages so that we can feed 64 people 2 dinner rolls.
Final answer: 16 packages