If order matters, then there are 12 ways to do this
If order does not matter, then there are 6 ways to do this
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We have 4 choices for the first slot and 3 choices for the next (we can't reuse a letter) so that's where 4*3 = 12 comes from
If order doesn't matter, then something like AB is the same as BA. So we are doubly counting each possible combo. To fix this, we divide by 2: 12/2 = 6
To be more formal, you can use nPr and nCr to get 12 and 6 respectively (use n = 4 and r = 2)
Answer:
15 miles
Step-by-step explanation:
the 2 mph is a red herring. If there is a rate of 10 mph, and the trip took 1.5 hours, the 1 hour=10 miles, and the .5=5 miles, add em up and its 15 miles
Answer:
A. After two minutes, a bear can manage to have 120 heartbeats.
B. The slope of blue line is 60/1.
C. The slope of red line is 12/1
D. The equation for blue line is y = 60/1x
E. The equation for red line is y = 12/1x
Answer:
To kilos? About 132.2. To dollars? Google the exchange.
