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How does the kidney work?

The kidney is the body's filtration system, and works by separating the fluid and cells that make up blood, then selectively reabsorbing what is still useful, so that we don't lose anything valuable but c...

Answered by Nkosi Y. • Biology tutor

3022 Views

Solve the simultaneous equations: 2x-3y = 16 x+2y= -6

x=2 y=-4

Answered by Nadia A. • Maths tutor

3397 Views

Find the value of x that satisfies the following equation: (3x + 2)/2 = 6x + 4

Step 1: Eliminate fractions => Multiply everything by 23x + 2 = 12x + 8 Step 2: Collect like-terms with all of the xs on one side => 9x = -6 Step 3: Divide through to find the answer in terms of x...

Answered by Jacob P. • Maths tutor

3386 Views

(diagram of compressed and enlarged cells) Why has the plant cell shrunk when put in salty water

This occurs due to the phenomenon of osmosis. The basic principle of osmosis is that when two substances of different saline concentration are separated by a permeable divider (plant cell wall) the concen...

Answered by Thea W. • Biology tutor

2603 Views

I struggle with the following type of question: "The first four terms of an arithmetic sequence are 5, 9, 13, 17. Write down an expression, in terms of n, for the nth term in the sequence." How should I approach this?

The way I would suggest approaching a question like this is to imagine n=1, n=2, n=3 and n=4 above the terms given, or even to literally write that above each of the 4 given numbers. n ---------- 1 2 3 4r...

Answered by William S. • Maths tutor

12202 Views