Calculate the Double Integral $$\iint _ { R } \left( 9 x ^ { 2 } y ^ { 3 } - 15 x ^ { 4 } \right) d A , R = \{ ( x , y ) \mid 0 \leq x \leq 1,0 \leq y \leq 4 \}$$

Q31: Calculate the double integral. <span

Q32: Use spherical coordinates.<br>Evaluate <span class="ql-formula"

Q33: Sketch the solid bounded by the

Q34: Calculate the iterated integral.Round your answer

Q35: <span class="ql-formula" data-value="\text { Evaluate } \iint

Q37: Use cylindrical coordinates to evaluate

Q38: Find the center of mass of the

Q39: Use the Midpoint Rule with four

Q40: Find the center of mass of

Q41: Find the mass and the center