Astore clerk has 45 shirts to pack in boxes. esch box hold 6 shirts what is the fewest boxes the clerk will need to pack akk the shirts

Can some one me with these questions

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

Write the percent as a fraction or mixed number in simplest form. 0.8%