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How does vaccination prevent infection?

White blood cells produce antibodies which are produced rapidly upon re-infection and these antibodies kill pathogens.
RA
Answered by Ruqia A. • Biology tutor
3141 Views

Do I need to write down all of my working out?

Yes, in order to maximise the amount of marks you obtain you must write down all of your working as often the answer is only worth 1 mark whereas the working out makes up the rest of the marks. Always show y...
CC
Answered by Charlie C. • Maths tutor
6651 Views

By using the substitution, x = 2sin(y) find the exact value of integral sqrt(1/3(4-x^2)) dx with limits 0 and 1.

In order to calculate this integral we must use the sustitution provided. x=2siny. Firtsly I will differentiate to find the dx component of the integral, so dx/dy=2cosy hence, dx=2cosydy. Now for the limits ...
SS
Answered by Sara S. • Maths tutor
6355 Views

Show that the line y = x - 7 does not meet the circle (x + 2)^2 + y^2 = 33.

To find potential points of intersection between the line and the circle, we need to solve the equations simultaneously. So, we substitute y = x - 7 into the equation of the circle: (x + 2) 2 + y 2 = 33 (x +...
AI
Answered by Anastasios I. • Maths tutor
19488 Views

How do I analyse the form and structure of a poem?

The form and structure is a critical aspect of any poem, but one which students typically find hard to analyse in a way which is relevant to the question asked. However to ignore this aspect of poetry in an ...
LS
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