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There is a simple way of making calculations with percentages. Say you want to subtract from a numerical value x,20%. Then multiply it with 80/100. Say you want to add 20%.Then multiply with 120/100. Say you...

Many students ask how they can they find 2 unknowns,given 2 simple equations. I'll try to focus in this answer on giving students a tool which they can use to solve ANY 2 simple equations with one solution.L...

A parametric equation is defined by a variable t such as y = 4t +1 and x = 2t, while general equation is defined sorely by y and x (in 2 dimensional space). As t is the free variable you can simply replace t...

In order to assess whether economics were the most important factor for reform in Russia under Tsar Alexander II, the emancipation of the serfs in 1861 under Tsar Alexander II must be considered. There is co...

The imperfect subjunctive is paired with a conditional in order to show that the conditional could happen, if the imperfect subjunctive were true. Therefore the imperfect subjunctive is used in order to expr...