The answer depends on the variables in the graph! In a graph of age against mass there is nothing that represents acceleration.
Exactly.
Velocity change vs Time
A period of constant positive acceleration;a second period of zero acceleration; a third period of constant negative acceleration.
Since distance is 1/2 at^2 where a is acceleration, it represents one half of the acceleration
The answer depends on what is plotted on the graph and what is happening with the acceleration then.
The slope of a velocity-time graph represents acceleration.
Acceleration.
Magnitude of acceleration (but conveys no informationregarding acceleration's direction).
The slope of a velocity-time graph represents acceleration.
The slope of a velocity-time graph represents acceleration.
exactly
Exactly.
This depends on what the graph represents. If it is a graph of velocity on the vertical and time on the horizontal, then if acceleration is at a constant rate, the graph will be a straight line with positive slope (pointing 'up'). If acceleration stops, then the graph will be a horizontal line (zero acceleration or deceleration). If it is deceleration (negative acceleration), then the graph will have negative slope (pointing down).
The answer depends on whether the graph is that of speed v time or distance v time.
Velocity change vs Time
magnitude of acceleration at every point on the graph
The Slope (which represents acceleration) of a constant velocity graph is Zero.