Repeated addition:
[ 1,3] + [1,3]+[1,3]= [a, b]
a=? b=?

With alll of except for the 2 that i did already

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents