It would have to be 89 because I solve it out
Answer:
72
Step-by-step explanation:
7.2 x 10 = 72 and 72 ÷ 10 = 7.2
Answer:
-9
Step-by-step explanation:
8x-4=6x-10
2x-4=-10
2x=-6
x=-3
-3x3= -9
Answer:
10 pieces
Step-by-step explanation:
divide the total length by length of each pieces
2.5/0.25
We must find UNIQUE combinations because choosing a,b,c,d... is the same as d,c,b,a...etc. For this type of problem you use the "n choose k" formula...
n!/(k!(n-k)!), n=total number of choices available, k=number of choices made..
In this case:
20!/(10!(20-10)!)
20!/(10!*10!)
184756
