What is the force of an object with a mass of 30 kg and an acceleration of 10 m/s2? The answer is 300N

Can some one me, i’ve been asking for so long

Place the following steps in order to complete the square and solve the quadratic equation,

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.