9C5 = 9!/[5!(9-5)!
9C5 = 9!/(5!)(4!)
You finish.
7P4 = 7!/(7-4)!
7P4 = 7!/3!
You finish.
"4 years less" means something - 4
"3 times her niece's age" means 3x, considering x if her niece's age.
4 less than 3x = 3x - 4
So the answer is that the expression 3x - 4 can be used to represent this problem.
Hope this helps!
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