Whats the answer to n/2+5=3? and how is it done? btw the n/2 is a fraction

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16