This means that it's 12 times f, then add that by 24. This f is a variable. It could be any number. First, try to find out what f equals. Then use that to find the answer.
This expression represents the equation of a straight line function. The number 24 represents the y intercept of the graph of this function. The number 12 represents the slope of the straight line, meaning that for every unit moved on the horizontal axis, 12 units are moved on the vertical axis.
