An equation that shows that two ratios are equal is a what

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)