H(c)=6.4+0.6c
6.4 is the constant
When the height of the cups is 18.4 the function is:
18.4=6.4+0.6c
Then you subtract 6.4 from both sides to get:
18.4-6.4=6.4+0.6c-6.4
12=0.6c
c=12/.6
c=20
5.7m questions
7.4m answers