Answer:
hypotenuse=root of( base square + height square)
Step-by-step explanation:
by using pythogorus theorem we can find the side of any right triangle square
Remark
Many calculators have a key that will do this in one step. Mine is one of them. So let's start with the answer and then we'll do it the long way.
9C3 = 84. You put it into your calculator as 9 2nF nCr 3 =
Solution

3*4*7 = 84 which is what you set out to show.
Answer:
55
Step-by-step explanation:
here's the working out i did