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A student cut a piece of potato into 10 discs, each 1mm thick and with a 10mm diameter. He then placed them in a beaker of deionised water. After a couple of days, they had increased in size- both thickness and diameter. Explain why this is the case.

The cells composing the potato tissue contain fluid, or cytoplasm. This contains dissolved salts and these ions attract water molecules; cations, or positive ions, attract the partially negatively charged ox...
EK
Answered by Eva K. • Biology tutor
3660 Views

Solve the simultaneous equations: y-2x-4 = 0 (1) , 4x^2 +y^2 + 20x = 0 (2)

Re-arrange (1) : y = 2x + 4 Square both sides: y^2 = 4x^2 + 16 Substitute (1) into (2) and simplify: 2x^2 + 9x + 4 = 0 Factorise the equation: (2x+1)(x+4) = 0 Solve for x: x = -1/2 and x = -4 Substitute thes...
GA
Answered by Giorgos A. • Maths tutor
10287 Views

How can I describe events in the future?

In English, we have 'I am going' + infinitive, for example, I am going to eat. This can describe an event in the near future. Then, we have the term "will" for talking about a future that is more d...
JK
Answered by Julia K. • Italian tutor
4007 Views

Why did Italy start fighting in the Second World War as late as October 1940?

The Second World War broke out in September 1939 following Adolf Hitler's invasion of Poland. Fascist Italy and Nazi Germany were allies, and had been since the Pact of Steel in May 1939. As a result, Italy ...
JK
Answered by Julia K. • History tutor
4159 Views

How much detail do I need to go into in my essay plan?

Your essay plan should not take up too much of your time, but at the same time it is essential you have a plan. It will provide for a more organised essay and will serve as an outline of a structure you can ...
KC
5033 Views