Find the inverse of the matrix (4, 2) (1, 2) if it exists

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.

Julius went on a volunteer trip to centralamerica and took medical supplies with him.he packed a bag with 50 pounds of supplies.he brought pieces of equipment that weighed10 pounds each and bottles of medicine thatweighed pound each prepresents thenumber of pieces of equipment he broughtand b represents the number of bottles ofmedicine he brought then the total weight canbe represented by the equation 10p+b 50.the brought 3 pieces of equipment, how manybottles of medicine did he bring?