Need in hurry important please

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Check the following equation for dimensional homogeneity: ⅆ mv=∫t1t2(f⁢cosθ)ⅆt where m is mass, v is velocity, f is force, θ is an angle, and t is time. check that each term in the equation has the following dimensions: [malbec] where you are to choose the coefficients a, b, c.