Top answers

How do you know how many roots a quadratic equation has?

To work out the number of roots a qudratic ax 2 ​+bx+c=0 you need to compute the discriminant (b 2 ​-4ac). If the discrimant is less than 0, then the quadratic has no real roots. If the discriminant is equal...
LC
Answered by Lizzie C. • Maths tutor
82996 Views

How do you work out the area of a triangle?

The area of a triangle is the (1/2) x (base x the height).
LC
Answered by Lizzie C. • Maths tutor
5428 Views

How do I know which method of diffirentiation to use?

The main methods of differentiation you need to know at A level are the chain rule, the product rule and the quotient rule. The chain rule should be used when the eqation is a function of a function. E.g. y=...
LC
Answered by Lizzie C. • Maths tutor
5628 Views

Although carbon dioxide is a linear molecule it is still a greenhouse gas. Explain why that is.

A greenhouse gas is one which absorbs infrared radiation from the Earth and re-radiates it, increasing the surface temperature of the Earth. Normally these molecules are non-symmetrical such as triflurometan...
LC
Answered by Lorenzo C. • Chemistry tutor
10580 Views

Garlic contains a chemical called Allicin which has antimicrobial properties. Describe how this could have occurred through natural selection.

Allicin has antimicrobial properties and can therefore protect garlic from fungal and bacterial infections and is coded for in the DNA of the garlic by an allele. The presence could have been the result of w...
LC
Answered by Lorenzo C. • Biology tutor
7326 Views