n(a*b)=30 n(a)=10 find n(b)

Question

slove this problem for my fundamentals of math 1 class

 ch.2 sets, whole numbers, and functions

 

answer choices a.20 b.3 c.4 d.10

Answer 1

n(a*b)=30

 

n(10b) = 30

 

n(b) = 3

 

Hope this helps, Cris!