Please help a can someone explain the what “;” means in this?

Mr switzer needs to buy new 1-foot tiles to cover his bathroom floor. the floor is 12 feet long and 8 feet wide. each square foot of tile will cost $1.79. in dollars what will be the total cost of the tiles he needs to buy.

Is the figure congruent? yes or no?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height