lease help with these!!! I have been trying for hours and it is just not clicking!
It's Calculus by the way.

1) y=5x^4 + 24x^3 + 24x^2 +7 is concave for?

2) The first derivative of the function f is given by f^'=(sin^2(x)/x)-(2/9) How many critical values does f have on the open interval (0,10)

3) If y=3x+6 what is the min. value of (x^3)y

4) If f^''(x)=(x-1)(x+2)^3(x-4)^2, then the graph of f has inflection points when x= 1, -2, or 4 (could be more than one)

Please answer what you can! I would be so grateful you have no idea.

Question

lease help with these!!! I have been trying for hours and it is just not clicking!
It's Calculus by the way.

1) y=5x^4 + 24x^3 + 24x^2 +7 is concave for?

2) The first derivative of the function f is given by f^'=(sin^2(x)/x)-(2/9) How many critical values does f have on the open interval (0,10)

3) If y=3x+6 what is the min. value of (x^3)y

4) If f^''(x)=(x-1)(x+2)^3(x-4)^2, then the graph of f has inflection points when x= 1, -2, or 4 (could be more than one)

Please answer what you can! I would be so grateful you have no idea.