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What is a public good?

A public good is a good that is non excludable and non rivalrous. Non excludable means that anyone can use it; the benefits are not limited to just those who paid for it. Non-Rivalrous means that consumption...
IW
3216 Views

Explain the meaning of the terms (a) gene and (b) allele

Gene = the portion of DNA coding for a particular proteinAllele = one of the alternative forms of a gene
CF
Answered by Charlotte F. • Biology tutor
2963 Views

Differentiate 3x^2 + 4x - 7

In order to differentiate a number, 2 steps are needed to be made. The first is to reduce the power of the number by 1 and then multiply that value to the first number. I will run you through the given quest...
JR
Answered by James R. • Maths tutor
5919 Views

Find the positive solution to the equation (x^2+9x+18)/(x^2-9)=10

If we first factorise the top and the bottom of the equation we can see that the top is equal to (x+6)(x+3) and the bottom is (x-3)(x+3). This means we can divide the top and bottom by (x+3) giving us a resu...
JR
Answered by Joseph R. • Maths tutor
3428 Views

Sketch a graoh of current against potential difference for a filament lamp and explain its shape.

(draw diagram on whiteboard) As the potential difference increases, the current increases, since V=IR (where V is the potential difference, I is the current and R is the resistance). Initially the current in...
TD
Answered by Tamanna D. • Physics tutor
2891 Views