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How do I know when to use the past preterite or the past imperfect?

This is something that as you use them more, they will come more naturally, but there are a few ways to remember them. In general, the preterite is use for a past action that has been completed and is finish...
AS
Answered by Ami S. • Spanish tutor
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How are the alveoli adapated for gas exchange

Blood leaves the right side of the heart via the pulmonary artery, which takes deoxygenated blood to the lungs so gas exchange may occur. Numerous alveoli are found here and these alveoli possess many invagi...
MA
Answered by Maryam A. • Biology tutor
3179 Views

Factorise 2x^2 - 7x -4

2 x -4 = -8 -8 x 1 = -8 (2x^2-8x)+(x-4) 2x(x-4) + 1(x-4) (2x+1)(x-4)
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Answered by Nicola M. • Maths tutor
3765 Views

A right-angle triangle has a hypotenuse of 8cm and an angle of 30 degrees. What is the opposite's length?

sinx = o/h sinx x h =o sin30 x 8 = 4cm The opposite is 4cm
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Answered by Nicola M. • Maths tutor
3922 Views

In what circumstances can an ionic compound conduct electricity? How?

An ionic compound in its molten or liquid form is able to conduct electricity due to the free movement of conducting metal ions that can carry charge
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Answered by Jalini K. • Chemistry tutor
2740 Views