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
hope it helps<3
Combination problem:
1) 30 C 5 = 142506
2) 13 C 4 = 715
-6
-5
-4
10
it's 324
divide 72 by 4 to get one side, then multiply the side by itself, 18 times 18