Ann made a 3 -step staircase using 18 toothpicks as shown in the figure. how many toothpicks does she need to add to complete a 5 -step staircase?

What is the value of the expression below? (81^2)^1/8

What ordered pair represents this equation? 3x-y=8 and x+y=2

Goods include kennels, leads, toys and similar accessories for pets what's percentages about what's percentages of the total amount spent on goods for $4736