i need helps in caluc 3

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I need helps in Homework in WebAssign around 30 questions needs to solve.The subjects are :

Chap. 12.1 Three-Dimensional space

Chap. 12.2 Vectors

Chap. 12.3 The Dot product

Chap. 12.4: The cross product

Chap. 12.5 Equations of lines and planes

chap. 13.1 Vector functions and space curves

chap.13.2 Derivatives &integrals of vect. functs

chap.13.4 Motion in space, veloc. & accel.

chap.13.3 Arclength and curvature.

Chap. 14.1 Functions of several variables

chap. 14.2 limits and continuity

chap.14.3 Partial derivatives

chap. 14.4 tangent planes & linear approximations

Chap. 14.5 Chain rule

Chap. 14.7 Maximum and minimum values

Chap. 14.8 Lagrange Multipliers

Chap. 14.6 Directional derivatives

chap. 15.1 double integrals over rectangles

chap. 15.2 Double integrals over general regions

chap. 15.3 Double integrals in polar coordinates

Chap. 15.4 Applications of double integrals

Chap. 15.5 Surface Area

Chap. 15.6 Triple integrals

Chap.15.7 Triple integ. in cylindrical coordinates

Chap. 15.8 Triple integ. in spherical coordinates

Chap. 16.2 Line integrals

Chap. 16.3 Fundamental Theorem of Line Integrals

Chap. 16.4 Green’s Theorem

Chap. 16.5 Curl and divergence

Chap. 16.9 The divergence theorem