An elevator goes up 7 floors and then down 4 floors. What integer represents the change in the floor level?
2 answers:
Answer:
3 floors.
Step-by-step explanation:
We have been given that an elevator goes up 7 floors.
We know that going up is a positive altitude, so 7 floors up will be positive 7.
Then the elevator comes down 4 floors. We know that coming down is a negative altitude, so coming down 4 floors would be floors.
The change in the floor would be floors.
Therefore, the change in the floor level is 3 floors.
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Answer:
a) 286
b) 1,037,836,800
c) 285
Step-by-step explanation:
a) Since order is not important, the total possible number of ways to choose 10 players out of 13 is the following combination:
b) The total number of possibilities to assign positions by the selecting 10 players is the permutation of 13 players for 10 positions:
c) The number of ways to pick 10 players including at least one woman is equal to the total number of ways to pick 10 players (found in item a) minus the the number of ways to pick 10 players without picking a single woman.
Since there 10 male players for 10 positions, there is only one possible way to pick a team without women, therefore: