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

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain

Precalculus question, image attached.

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square