The main entrance of the Louvre art museum is shaped like a pyramid. The pyramid is 72 feet tall, with a square base with an apothem of 30 feet. Each side of the square base measures 60 feet. (Hint: The apothem goes from the center of a shape to the midpoint of a side.) Which of the following is closest to the total surface area of the pyramid?​

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14

Solve the equation. 2x - 8(x+1)= 6(2x - 3)