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The subjunctive mood is a very useful (and impressive!) tense to use when writing and speaking and it enables you to express yourself in many more ways, but it is difficult sometimes to get your head arou...

First of all, "second derivative", d²y/dx², is what you get when you differentiate the first derivative (dy/dx).

The second derivative can be used as an ea...

Advantages:

-> Repeatable - the same design can be achieved every time with very good accuracy.

-> Economic - hundreds of copies of the design can be produced b...

Remember that to calculate resistances in parallel, the formula we use is:

1/R_t = 1/R₁ + 1/R₂ etc.

So that gives us:

1/R_t...

To work out averages we add up all of the ages and divide by the number of people in the group.

So that means in the first group, before the new person joined in, all the ages added up an...