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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
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A tank contains 45 000 cm3 of water. The tank leaks at 0.75 litres/minute. How long does the tank take to empty?

The first thing to notice with this question is that the volume of the tank is given in cm 3 yet the rate at which the water leaks is in litres, so a conversion of units will be neccessary. We know that ther...
TG
Answered by Tom G. • Maths tutor
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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
12922 Views

What should I emphasise in my personal statement.

Subjects Your CV covers your subjects, but your PS allows you the opportunity to show that you undertsand the implications of what you are learning, how they apply to what you want to study at university and...
JC
2978 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
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