6ab when a=1/2 and b=7. What is the value

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Find the cosine function that is represented in the graph.