Search our library of homework questions

Top answers

All subjects

All levels

What does differentiation actually do?

Differentiation allows you to find the rate of change of a variable relative to another, which is basically the gradient. So if you had a speed-time graph, finding the amount that speed changes over a giv...

Answered by Kourosh S. • Maths tutor

3197 Views

Describe the flow of an RBC from the right atrium through to the aorta. How might this change if there was a hole between the two atria? When/why might you want a hole between the two atria?

SVC, RA, RAVV/Tricuspid, PA, PV, LA, LAVV/Bicuspid, LV, Aorta, Body.Because the RV has a higher pressure than the LA, a hole between the atria would largely result in blood flow bypassing the ventricle in...

Answered by Sohail D. • Medical School Preparation tutor

1230 Views

Find the equation of the tangent to the circle x^2 + y^2 + 10x + 2y + 13 = 0 at the point (-3, 2)

First, what is a tangent? A line which touches a circle (or ellipse) at just one point. In our case (-3,2)
As it touches the line at one point, it is perpendicular the radius at (-3,2). Which implies...

Answered by Patrick D. • Maths tutor

5758 Views

When do halogens displace each other in solutions of their salts?

More reactive halogens displace less reactive halogens. The more reactive halogens are those at the top of the group, as their outer electron shells (negatively charged) are closer to the nucleus (positiv...

Answered by Anastasia P. • Chemistry tutor

3594 Views

When is Chi-squared the most appropriate statistical test to use?

Chi-squared is about establishing whether the difference in results between groups is likely to be due to chance, or due to some genuine difference in the groups' properties. It aims to answer the questio...

Answered by Anastasia P. • Biology tutor

2210 Views