Helpp
(Show ur work please)
This is law of cosine

What is the rescursive formula for this geometric sequence? 7, -14, 28, -56

Figure abcde is a regular pentagon. segment ae is located at a (2, 1) and e (4, 1). what is the perimeter of abcde? 4 units 6 units 8 units 10 units

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11