Answer:
3.14 cm²/min
Step-by-step explanation:
rate of increasing of radius, dr/dt = 0.01 cm/min
r = 50 cm
Area of plate, A = πr²
rate of increase of area
dA/dt = 2πr dr/dt
dA/dt = 2 x 3.14 x 50 x 0.01
dA/dt = 3.14 cm²/min
Thus, the increase of rate of area is 3.14 cm²/min.
x = -2
so 0.5 x (2-(-2)) = 0.5 x 4 = 2
Answer: the second one
235.62 cubed yards
Area of a cylinder = pi(r^2)*h
pi(5^2)*3 = 235.62
