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Solve these two simultaneous equations.

eq.1 4x+3y=7eq.2 3x+7y=16
You want to eliminate one of the variables (either x or y) reducing the problem to just one equation with one variable which can be solved. This can be done by multiplying e...

Answered by Tobias H. • Maths tutor

4281 Views

Integrate xsin(2x) by dx between the limits 0 and pi/2.

First it is important to identify that this is an integration by parts question as it can't be solved by substitution.
Let I = integral for ease of notation.Write out integration by parts formula I(...

Answered by Benedict A. • Maths tutor

7090 Views

What is a radical and why is it important them?

The Chinese script is not an alphabet like in English; instead, it uses characters to represent whole words, often based on their meaning rather than their pronunciation. For example, the character 木 mean...

Answered by Samuel A. • Mandarin tutor

2184 Views

Define the term 'water potential' and describe the difference between isotonic, hypotonic and hypertonic solutions. Suggest the different effects on cells placed in the different solutions.

Water potential basically means how likely it is for water molecules to diffuse out of or into a solution.Pure water (i.e. water with no solutes) has a water potential value of 0.As you add solutes (i.e. ...

Answered by Elliot T. • Biology tutor

38015 Views

Two students are provided with a starting pistol, a stopwatch and a long measuring tape. The starting pistol produces a loud sound and a puff of smoke. Describe how the students use the apparatus to calculate the speed of sound.

The students stand at a distance of 200 m from each other (measured with the measuring tape). Student 1 fires the pistol, Student 2 starts the stopwatch when they see smoke from the pistol and stop it whe...

Answered by Josh M. • Physics tutor

14201 Views