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In Spanish, how do we know whether to use the preterite tense or the imperfect tense?

To start with, the preterite is used in two main cases: is the tense which you use to say (1) what you did or (2) what happened . To form the preterite of regular verbs, remove the –ar, –er or –ir from the i...
RD
Answered by Rocio D. • Spanish tutor
2702 Views

find all the roots to the equation: z^3 = 1 + i in polar form

1st write 1+ i in polar form, sketch a diagram to find the angle ( =pi/4) and find the modulus ( sqrt(2))z^3 = Sqrt(2) E^ipi/4This is true for all equivalent solutions (add 2kpi) z^3 = sqrt(2)e^(pi/4 +2kpi)i...
RM
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Find an expression in terms of powers of cos(x) for cos(5x)

De Moivre's theorem states that e ix = cos(x) + isin(x) or that e i5x = cos(5x)+ isin(5x). If the real components of both sides of this equation is taken we can see that : cos(5x) = Re[e i5x ] where Re means...
AA
Answered by Arnav A. • Maths tutor
8020 Views

How is energy generated from carbohydrates?

The breakdown of carbohydrates from foodstuffs produces mono and disaccharides. These sugars are converted into glucose to be respired for energy generation. Respiration catabolises (breaks down) glucose, to...
LE
Answered by Lizzie E. • Biology tutor
4712 Views

Explain the short run shutdown point for a firm.

Generally a firm should shutdown if it's revenue is less than it's total cost. However in the short run since fixed costs (e.g. rent) have already been paid the firm only considers it's variable costs (e.g. ...
TD
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