How do you solve 3.16 divided by 0.04? Sorry i couldn't use the divison sign because i'm using a computer.

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.

Find the values of y: 3y^3(y^2+ 2/3y)=0