In an experiment to see if eating breakfast increases concentration on math assignments, the independent variable would be: a. breakfast b. the children c. math scores d. the observational factor

A. breakfast

Explanation:

An independent variable is the one which can be altered in an experiment manually. Such changes can be observed on the dependent variable, which cannot be changed by self manipulations instead change with the changes occurring in independent variable. The dependent variable is useful for framing the result of the experiment.

According to the given situation, the breakfast is the independent variable as in the study it is to determine the effect of eating the breakfast have on the concentration on math assignment which is the dependent variable of the experiment.

the answer would be   dignified - apex

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.