Given the sequence -3, 9, -27, 81, -243, ..., find the recursive formula. A. a1=−3 and an+1=2an
B. a1=−3 and an+1=−2an
C. a1=−3 and an+1=−4an
D. a1=−3 and an+1=−3an

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.

State if the two triangles are congruent. if they are, state how you know?

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1