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How do I answer long answer questions on (eg.) diffusion/active transport/osmosis

So, the first thing to look at in long answer questions is the number of marks they're awarding. The next is to read the question a few times over and make sure you really understand what they're asking from...
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Answered by Stephanie C. • Biology tutor
5987 Views

Solve these simultaneous equations and find the values of x and y. Equation 1: 2x + y = 7 Equation 2: 3x - y = 8

We have two reliable methods of solving this simultaneous equation. We can either eliminate the variables (x or y) directly, or make one of the variables the subject of the equation. I will show you how to e...
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Answered by Quincy W. • Maths tutor
3701 Views

How do you use the conditional tense in German?

Konjunktiv II (also known as the subjunctive II) is a verb form which can be used for conditional statements, to express uncertainty, contrary-to-fact statements and polite requests. To use Konjunktiv II in ...
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Answered by Ellie M. • German tutor
3545 Views

Derive an expression to show that for satellites in a circular orbit T^2 ∝ r^3 where T is the period of orbit and r is the radius of the orbit.

This question is concerned with balancing forces. First, we must consider what forces are acting on the satellites. What is stopping the satellite from shooting off into space and what is preventing it from ...
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Answered by Charlie M. • Physics tutor
10427 Views

Why is the derivative of the exponential function itself?

The exponential function is defined as a power series, which we may (for reasons that are beyond the scope of A-level) differentiate term by term to get another power series. The general term of the series d...
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Answered by George B. • Maths tutor
5041 Views