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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...

Remember the rules for differentiation?

We take each term which looks like axⁿ where a and n are just numbers and we turn it into: (an)x^n-1

So for this...

There is no need to solve the quadratic equation here. Use the formulae for the sum and product of roots where:

a+b = -b/a

and

ab = c/a

Therefore...

Always begin answering questions by providing a definition. This is key in economics. Therefore, start by explaining that the national min. wage is the governments guarentee of a minimum wage per hour ...