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When to use the verb "ser" or "estar"?

The Spanish verbs "ser" and "estar" both mean "to be " but they are used differently."Ser" is used for a permanent state (that don't change). E.g.: "Soy una mujer...
JN
Answered by Jazmina N. • Spanish tutor
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Prove by contradiction that sqrt(3) is irrational. (5 marks)

To the contrary assume that sqrt(3) is a rational number. Thus we can write sqrt(3) = a/b where a and b are coprime integers and b is non-zero. (1 mark for this or equivalent statement - may have that this f...
DS
Answered by Dan S. • Maths tutor
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Explain why for heavy nuclei there is imbalance in the number of protons and neutrons. Give reference to the range and particle type of the forces that influence this imbalance.

In the nucleus the forces that govern how the body is kept together is the Strong Nuclear Force and the Electromagnetic Force, these two force differ in range and the type of particle they interfere with. Th...
Answered by • Physics tutor
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Curve C has equation x^2 - 3xy - 4y^2 + 64 = 0. a) find dy/dx in terms of x and y. b) find coordinates where dy/dx=0.

a) This is no standard differentiate question. You will need identify the fact that the equation contains both x and y terms and thus you will need to differentiate with respect to both. This involves applyi...
ED
Answered by Emma D. • Maths tutor
4668 Views

What is meant by the term 'checks and balances'?

The term 'checks and balances' defines the ability of different branches of government to stop each other from acting; it is designed to prevent one branch from gaining an inordinate amount of power. An exam...
SM
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