3^x - 3^(x-1) = 18 then 4^x is equal to

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c?

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)