When a certain constant force acts upon an object with mass 4 kg, the acceleration of the object is 7 m/s². When the same force acts upon another object, its acceleration is 2 m/s². What is the mass of this object?

Question and answers are in the attached picture. you so much in advance.

Yesterday i ran 5 miles. today, i ran 3.7 miles. did my percent increase, decrease or is it a percent error? plz i need

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?