Top answers

What are the differences between the imperfect and preterite tense?

They are used to describe two different types time in the past. The imperfect is used largely to describe an ucompleted action (Estaba en el telefono cundo mi madre gritó) or an interruped action, a repeated...
ET
Answered by Elisabeth T. • Spanish tutor
2605 Views

Use the geometric series formula to find the 9th term in this progression : 12 18 27...

Formula for nth term in a geometric progression = ar^n-1 workings: a=12 r=1.5 because 18/12 = 1.5 Thus, using ar^n-1 --> 12 * 1.5^8 = 307.54... or 308 (to 3sf) (In an ideal scenario question we'd be worki...
PF
Answered by Philip F. • Maths tutor
9112 Views

Describe the roles of calcium ions and ATP in the contraction of a myofibril (5 marks)

Calcium ions, which diffuse in from the sarcoplasmic reticulum, cause tropomyosin to shift which reveals the myosin binding site located on the actin filament allowing the myosin head to bind. A molecule of ...
MY
Answered by Molly Y. • Biology tutor
13128 Views

Can you explain how insulin levels change during exercise

Insulin is a hormore secreted by the pancreas, and its basic function is to make blood sugar (glucose), be absorbed into the body. Now we can imagine that this happens when the blood sugar is too high, becau...
JC
6011 Views

In what ways does Shelly's Frankenstein benefit from having Walton as a narrator?

Frankenstein’s structure is that of a frame narrative, which is used to emphasise the Doppelganger effect and the gothic convention of 'The Other' both familiar and unfamiliar to our human condition. The dua...
MG
Answered by Molly G. • English tutor
11034 Views