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What is the difference between the imperfect and the perfect tense?

The perfect tense, or "passé composé" is used to demonstrate an action that is in the past and has been completed, for example "Yesterday, I went to the shop", " Hier, je suis allé(e...
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Answered by Phoebe T. • French tutor
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What is the derivative of y = (3x-2)^1/2 ?

Use the chain rule, u = 3x-2dy/dx = dy/du du/dxdy/du = d(u^1/2)/du = 1/2 u ^-1/2power down and minus 1du/dx = 3constants =0so, dy/dx = 3 1/2 (3x-2)^-1/2= 3/2 (3x-2)^-1/2
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Answered by Chloe J. • Maths tutor
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Explain: 1. Why butanoic acid has a higher boiling point than butan1-ol? 2. Why carboxylic acids of short chain length are more soluble in water than those with longer carbon chain length?

1 .Butanoic acid has stronger intermolecular forces (hydrogen bonding) because it has two highly electronegative oxygen atoms in its structure, whereas butan-1-ol has only one. Therefore the acid molecules c...
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Answered by Samuel L. • Chemistry tutor
25066 Views

Outline and explain the psychodynamic approach in psychology

The psychodynamic approach looks at the unconscious basis of behaviour. According to Freud, the personality is split into 3 parts: the ID satisfies selfish needs; the superego satisfies moral needs and the e...
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Answered by Daisy R. • Psychology tutor
26594 Views

Explain How Macrophage becomes an Antigen presenting cell

Phagocytosis occurs:The Macrophage surrounds and envelops the pathogen with pseudopodia The pseudopodia envelops the bacteria completely forming a vesicle, called a phagosomephagosome is fused with a lysosom...
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Answered by Ibtihaj C. • Biology tutor
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