My first Notebook

Section 1: 2-4

N[718/3, 2]

Solve[2x-9==0,x]

Sum[n,{n,1,10}]

Section 2: 5-7

Plot3D[Sin[x*y],{x,-Pi,Pi},{y,-Pi,Pi}]

Plot3D[Sin[x y],{x,-π,π},{y,-π,π},Mesh->All,MeshFunctions->Automatic]

(3 x^2 + 2 x + 5)/(x - 7 x*5)

Exp[-Integrate[P[x],x]]*(Integrate[Q[x]*Exp[Integrate[P[x],x]],x] + C)