Solve Truss by the method of joints.  The solution is simplified by recognizing symmetry.

End of chapter exercises for Engineering Statics: Open and Interactive 

Given a linear programming problem in standard form, write down the dual problem.

Locate the centroid of a rectangle, triangle, and semi-circle on a coordinate grid.

End of chapter exercises for Engineering Statics: Open and Interactive 

Collection of questions on factorising quadratics with a=1.

Factorise a quadratic equation of the form $x^2+bx+c$ with one positive and one negative root.

Factorise a quadratic equation of the form $x^2+bx+c$ with one positive and one negative root.

Factorise a quadratic equation of the form $x^2+bx+c$ with two positive roots

Factorise a quadratic equations of the form $x^2+bx+c$ with 2 negative roots.

Factorising without powers

Factorise an expression of the form $ax^n+bx^m$.

Factorise an expression of the form $ax+bxy$ for variables $x$ and $y$.

Factorise an expression of the form $ax+bx^2$.

Factorise an expression of the form $-ax-b$ for numbers $a,b$

Factorise an expression of the form $-ax-b$ for numbers $a,b$

Selection of questions on substituting values into simple expressions

Substituting a values of $x$ and $z$ into $\frac{ax+bz}{c}$

Substituting a values of $x$ and $z$ into $a(x+z)$

Substituting a values of $x$ and $z$ into $ax+bz$

Substituting a value of $x$ into $ax+b$

Substituting a value of $x$ into $x^2$ or $x^3$.

Substituting a value of $x$ into $x/a$.

Substituting a value of $x$ into $ax$

Substituting a value of $x$ into $x+a$.

Solving linear equations with unknowns on both sides

Solving equations of the form a(ex+b)=c(fx+d)

Solving equations of the form a(x+b)=c(x+d)

Solving equations of the form ax+b=cx+d where 2<|a-c|<13