Search our library of homework questions

Top answers

All subjects

All levels

[based on MAT 2018 (G)] The curves y = x^2 + c and y^2 = x touch at a single point. Find c.

If helpful draw a diagram to see what is going on, but keep the time in mind! From your sketch it should be apparent that c must be positive and that the single point of contact of the curves is above the...

Answered by • MAT tutor

1829 Views

What is the difference between 'qui' and 'que' in subordinate clauses?

'Qui' and 'que' are relative pronouns, both meaning either 'who' or that'/'which'. The problem is that the French grammar works differently to English grammar when it comes to relative pronouns, meaning a...

Answered by Annie H. • French tutor

2398 Views

The point P has coordinates (3, 4) The point Q has coordinates (a, b) A line perpendicular to PQ is given by the equation 3x + 2y = 7 Find an expression for b in terms of a.

y = (7-3x)/2m = ^-3/₂therefore:Y = ²/₃ X + cwhen Y = 4 and X = 3, c = 2therefore b = ²/₃

Answered by Dilan P. • Maths tutor

3519 Views

How could ionic interactions be used in DNA-RNA hybridisation?

The DNA double helix consists of many hydrogen bonds between the base pairs, but in addition there are negatively charged phosphate molecules as a key component of the sugar-phosphate backbone of DNA stra...

Answered by Mohammed A. • Biology tutor

1354 Views

A staircase has n steps. You can scale the stairs by taking steps one or two at a time. How many ways are there to scale the steps?

If there are 0 steps, there is 1 possibility (you are already done).If there is 1 step, there is 1 possibility (you take one step).If there are n steps, your first choice is either 1 step or 2 steps:Choic...

Answered by • Oxbridge Preparation tutor

1607 Views