35
the ratio for the two is 5:7 and you want to find _:49. to get from 7 to 49 you multiply the 7 by 7. because you did that to one side you have to do the same to the other and multiply 5 by 7 which gives you 35
The answer would be 7.225.
I believe the answer would be 6.96 cm
You would multiply 2 1/2 and 3 3/4, which would give you 9.375 or as a mixed number 9 7/8
You have 11 items and you need to choose 5 of the 11.
There are 462 ways to choose them.
The formula is :
11! / (5!6!)
n!/(r!(n-r)!)