Pls help me with this pls
its in sound waves

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Drag each tile to the correct box. tiles bra i sequence