If y = 2x^3 - 4x and dx/dt = 4, find dy/dt when x = 1. give only the numerical answer. for example, if dy/dt=3, type only 3.

dy/dt = 8    

Step-by-step explanation:

y = 2x^3 -4x

dy/dt = 2 * 3x^2 dx/dt -4 dx/dt

dy/dt = 6x^2 dx/dt - 4 dx/dt

substitute dx/dt =4 and x=1

dy/dt = 6 * (1)^2 * 4 - 4(4)

dy/dt = 24-16

dy/dt = 8

518,400

step-by-step explanation:

the area is multiplying all the given measurements together.

40 * 18 * 30 * 24 = 518,400