What expressions are equivalent to 2k+2+k+3+2k

In factoring by grouping, what would you have for step 3 for the following? step 1: x^3 +5x^2 +4x+20 step 2: x^2 (x+5)+4(x+5) step 3: ?

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.