Yes, , so , from where when .James blowing machine blows spherical bubbles whose surface area ,S, increases at the rate of 25cm^2/s. What is the rate the of increase of the radius,r, when the radius is 5cm?

I ended up with 0.199cm/s

I agree with maximum and minimum. The inflection point is (0, 2) because the second derivative changes sign from negative to positive. The curve is concave down when the second derivative is negative.find maximum,minimum or point of inflection

f(x)=x^3-3x+2

give the values of x which are concave down

i got (-1,4) as maximum and (1,0) as minimum unsure about concave bit

I am not sure I understand the question.is this correct?

2)3sqrr(2x-1)

2/3(2x-1)^2/3