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x^2 - 10x + 21 = 0

First, factorise the quadratic equation. Find two numbers that multiply to give 21 and add to give 10. 7 and 3 (x-7)(x-3)=0 Now find the value x so that when these brackets are multiplied together the answer...
BS
Answered by Ben S. • Maths tutor
5118 Views

rex Aegypti duos liberos habebat. hi liberi erant Cleopatra et Ptolemaeus. per multos annos liberi vitam laetam cum patre habebant. deinde post mortem patris Cleopatra erat regina. [passage taken from sample paper, own questions below]

How many children did the king have and what were their names? We look at the first line, which translates to: The king of Egpyt had two children, Cleopatra and Ptolemaeus. The nominative is 'rex' (king), th...
RA
Answered by Rania A. • Latin tutor
6430 Views

What is the Philips Curve?

Philips Curve shows the inverse relationship between inflation and unemployment. So as unemployment decreases inflation rises. This is because when unemployment is low, firms have to increase wages to compet...
KL
Answered by Kalpana L. • Economics tutor
5136 Views

What is the difference between the verbs saber and estar?

Ser is used for: -descriptions: Yo soy Maria, I am Maria -occupations: Mi padre es abogado, My dad is a lawyer -characteristics: El es inteligente, He is intelligent -time: Hoy es martes, Today is Tuesday -o...
MR
Answered by Maria R. • Spanish tutor
2401 Views

What are the names given to the body's first and second line of defence against disease? Name an example for each and how it works to prevent disease.

The first line of defence is passive immunity. An example is the skin and its job is to prevent a pathogen entering the body in the first place. Pathogens cannot penetrate the skin. The second line of defenc...
EP
Answered by Eric P. • Biology tutor
7326 Views