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The area of a square is 49cm^2. The perimeter of the square is equal to the circumference of a circle. what is the radius of the circle?

This is a geometry question. We know that a square has 4 equal sides of x, and that it's area is given by A=x 2 . So we can work out the length of the side of the square. x=sqrt(49) = 7 We are told this is e...
JC
Answered by Julia C. • Maths tutor
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Solve these simultaneous equations: y=3x-10; y=2x+5

Method 1 (algebraically): Since we have "y=" at the start of both equations, we can substitue one into the other to get 3x-10=2x+5 Then we want all the x terms on one side of the equation, and all ...
CW
Answered by Catherine W. • Maths tutor
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What is a nephron?

Nephrons are units of the kidney which are specially adapted for filtration and reabsorption of substances in the blood. Each nephron is composed of different various parts which have specific roles. These p...
LH
Answered by Laetitia H. • Biology tutor
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How do I analyse 'character' in my exam?

Character analysis is an essential skill used in all English Literature GCSE exams. The ways that a character is presented in a text, their importance to the overall meaning and their interactions with other...
HR
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Why do bacteria become resistant to antibiotics?

Antiobiotics kill bacteria but bacteria can become resistant to antibiotics. This happens through a process called natural selection. Within a group/population of bacteria they will all have small difference...
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Answered by Lysander G. • Biology tutor
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