The a value of a function in the form f(x) = ax2 + bx + c is negative. Which statement must be true?

A. The vertex is a maximum.
B. The y-intercept is negative.
C. The x-intercepts are negative.
D. The axis of symmetry is to the left of zero.

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar