A trend line is a line that indicates the tendency of a graph; in other words, is the line that shows the apparently direction of a group of points on a graph. There are various types of trend lines; let’s check them:
Linear
Linear trend lines are used when the points on your graph follow a straight line pattern, which means that something is increasing or decreasing at a fixed rate (the slope of the straight line).
Logarithmic
Logarithmic trend lines are curved lines used when the rate of change increases very quickly and then settles down.
Polynomial
Polynomial trend lines are curved lines used when the data oscillates (change in direction from increasing to decreasing or vice versa).
Power
Power trend lines are curved lines used when you have a positive set of data that increases at a specific rate.
Exponential
Exponential trend lines are curved lines used when you have a set of data that increase or decreases at increasingly or decreasingly higher rates.
Moving averages
Moving averages are used when your data that varies a lot. They can be straight lines, curved lines or a combination of both.
As you can see, all trend lines are either straight lines or curved lines; therefore, the correct answer is a. curved lines or straight lines
