What is the product of 4x+7x

The answer is:

11x

Explanation:

Why:

because whenever you have two numbers with the same variable, you can add or subtract it from the other variable (think of it like regular math but with variables).

Hope this helps! ;)

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.