A bag contains 5 white marbles and 5 blue marbles. You randomly select one marble from the bag and put it back. Then, you random
2 answers:
You might be interested in
<h2>
</h2>
。。。。。。。。。。。。。。。。。。。。。。。。。。。。
- 》5! ( 2 × 1 ) - 4! × 3!
- 》5! ( 2 ) - ( 4! × 3! )
- 》5! ( 2 ) - ( ( 4 × 3 × 2 × 1 ) × ( 3 × 2 × 1 ) )
- 》5! ( 2 ) - ( 24 × 6 )
- 》5! ( 2 ) - 144
- 》( 5 × 4 × 3 × 2 × 1 ) ( 2 ) - 144
- 》120 ( 2 ) - 144
- 》240 - 144
- 》90
。。。。。。。。。。。。。。。。。。。。。。。。。。。。
Answer:
Danielle drove 3 hours
Step-by-step explanation:
Suppose Heather moved in the x direction.
Then Danielle moved in the opposite direction, that is, she moved in the -x direction.
Let's call ,
,
at the speed, distance and time that I code Heather
Let's call ,
,
at the speed, distance and time Danielle codes.
Observe the following diagram:
(x) Heather <------ --------- hospital ----------
-----------> Danielle (-x)
So:
We know that after 4 hours the distance between Heather and Danielle was 290 km.
That is to say:
We know that
We already know , the distance from the hospital to Heather, so we can find
and thus know
So:
Then: