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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. Work out the radius of the circle. Give your answer to 1 decimal place.

Area of a square (A s ) = Side length (L) 2 L = square root A s L = square root 49 L = 7 cm Perimeter (P) = 4L P = 4 x 7 P = 28 cm P = Circumference (C) C = 28 cm C = 2pi x Radius (r) r = C / (2pi) r = 28 / ...
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Answered by William D. • Maths tutor
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Explain how natural selection can lead to new species forming (speciation)

Within a gene pool of a population, there is genetic variation, due to mutation. This leads to phenotypic variation. Some individuals will be better adapted to the environment than others and will therefore ...
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Answered by William D. • Biology tutor
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What is natural selection?

Within a population of a species there is great geetic variation giving rise to variation in their phentoypes. Some phenotypes enable an organism to be better adapted to its environment than other members of...
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Answered by Sabrina A. • Biology tutor
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How does covalent bonding work?

Covalent bonding relies on the fact that all atoms are desperately trying to get a full outer shell of electrons. By full outer shell we mean 2 electrons in the first shell, 8 in the 2nd shell, 8 in the 3rd ...
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Answered by Sabrina A. • Chemistry tutor
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Find the roots of the quadratic equation, x^2 - 8x + 24 = 0, by completing the square.

Step 1: The fisrt step is to use the following formula when asked to complete the square, ( x + (b/2) ) 2 - (b/2) 2 + c = 0 Step 2 In our case, b=8,c=24 Hence our equation, x 2 - 8x + 24= 0 becomes (x + (-8/...
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Answered by Pantelis K. • Maths tutor
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