Answer:
90
Step-by-step explanation:
10!/(10-2)!
n!=n(n-1)!
10•9•8!/(10-2)!
10•9•8!/8!
The 8! cancels out and you're left with 10•9
So, your answer is 90
Answer:
see below
Step-by-step explanation:
75% of what number is 150
75 150
----- = ---------
100 x
75*2 = 150
So multiply the left by 2/2
75*2 150
----- = ---------
100*2 x
150
------
200
Answer:
x=30
y=15
z=150
Step-by-step explanation:
take 2x+x+90=180
we get x=30
and y=15 and z=150
3/15 equals 1/5 because 3/3=1 and 15/5=5. So B is the correct answer. 1/5