Someone decode this please My friend sended this he said it was a bit horror but yeah i need help with this

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Avalue that describes how heavy an object is and is related to the force of gravity is

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].