Top answers

Why do veins have valves and why don't arteries have them?

The heart pumps the blood into the arteries with a very high pressure and the blood can therefore travel through them to the tissue of interest. The arteries are also very elastic, therefore they can pulsate...
AC
Answered by Ana C. • Biology tutor
15785 Views

Are the tutors trying to trick you?

So, my instinct in answering this question is a definite NO. There are a lot of terrible myths going around that present Oxbridge interviews as some kind of MI6 screening scenario . I remember when I was app...
ES
2326 Views

Hey I am having difficulties solving simultaneous equations? Please may you help me!

Yes of course. I will start with an example. Try and solve these simultaneous equations I will talk you through the model answer below. 3x + y = -4 3x - 4y = 6 Notice both equations contain 3x we can therefo...
GW
Answered by Georgina W. • Maths tutor
3169 Views

Given y=rootx + 4/rootx = 4, find the value of dy/dx when x=8, writing your answer in the form aroot2, where a is a rational number.

First, we will write out the equation, writing the root x values in a way that allows us to differentiate them. Root x can be written as x^1/2 and 4/rootx can be written as 4x^-1/2. Now we can differentiate....
Answered by • Maths tutor
13919 Views

What is the gerundival attraction?

Although the name sounds scary, it is easier that it seems. In Latin when a gerund has an object, there is a tendency to harmonise the terminations of the two, so the object will agree with the sense of the ...
Answered by • Latin tutor
2678 Views