Question

THE EDGES OF A CUBE ARE EXPANDING A A RATE OF 5 CENTIMETERS PER SECOND.HOW FAST IS THE SURFACE AREA CHANGING WHEN EACH EGDE IS 4.5 CENTIMETERS?????

Answer 1

dr/dt =+5

Answer 2

the surface area is changing at a rate of (12)(4.5)(5) cm/s

Answer 3

A= 6r^2

Answer 4

dA/dt = (dA/dr) x ( dr/dt )

Answer 5

sub in values