What is the purpose of asking a patient what their chief complaint is at their dental appointment?

What are the signs of the following derivatives?

Which of the following solids has a volume equal to the integral ∫π2π∫02/2∫z1-z2 r drdzdθ{“version”:”1.1″,”math”:”∫π2π∫02/2∫z1-z2 r drdzdθ”}

Which of the following solids has a volume equal to the integral ∫01∫-1-y21-y2∫1-y2-x21  dzdxdy{“version”:”1.1″,”math”:”∫01∫-1-y21-y2∫1-y2-x21  dzdxdy”}

Which of the following solids has a volume equal to the integral ∫-11∫01-y2∫1-y2-x21  dzdxdy{“version”:”1.1″,”math”:”∫-11∫01-y2∫1-y2-x21  dzdxdy”}

Which of the following solids has a volume equal to the integral ∫0π∫0π/4∫01 ρ2 sinϕ dρdϕdθ{“version”:”1.1″,”math”:”∫0π∫0π/4∫01 ρ2 sinϕ dρdϕdθ”}

Which of the following solids has a volume equal to the integral ∫π2π∫01 r2 drdθ{“version”:”1.1″,”math”:”∫π2π∫01 r2 drdθ”}

Which of the following solids has a volume equal to the integral ∫π/23π/2∫01∫0r r dzdrdθ{“version”:”1.1″,”math”:”∫π/23π/2∫01∫0r r dzdrdθ”}

What is the approximate direction of the gradient vector at each of the following points?

Which of the following solids has a volume equal to the integral ∫0π∫01∫r1-r2 r dzdrdθ{“version”:”1.1″,”math”:”∫0π∫01∫r1-r2 r dzdrdθ”}