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How do I calculate a percentage increase? For example; there are 15 fish in a fish tank, after a year they have bred and now there are 20 fish in the tank. By what % has the number of fish increased?

Original value = 15 New Value = 20 Difference = New value - original value 20 - 15 = 5
(Difference / original) x 100(5/15) x 100 = 33.3%

Answered by Seyi A. • Maths tutor

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Circle with centre C, and points A,B,D and E on the circumference of the circle. BD is the diameter of the circle. Angle CDA is 18 deg and angle AED is 31 deg. Find angle EDA.

Circle theorem: angle in a semi-circle is a right angle.Therefore angle BAE = 90 + 31 = 121 degrees ABDE is a cyclic quadrilateral and:Circle theorem: Opposite angles in a cyclic quadrilateral sum to 180 ...

Answered by Jasmin H. • Maths tutor

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Write a piece of descriptive writing under 1000 words

Golden rays of joy radiate through time-honoured glass. Bells sing, calling to students and teachers alike. It is a cheerful Friday afternoon; an air of feverish delirium coats the school. Picturesque and...

Answered by Oliver K. • English Literature tutor

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How do I solve a quadratic equation like x^2 - 2x - 35 = 0 without using a calculator?

If possible, you should try to factorise a quadratic. To do this, look a the factors of the constant, in this case -35. 35 is clearly divisible by 5, and 35 / 5 = 7, so 5 and 7 are one pair of factors. Th...

Answered by Alfie H. • Maths tutor

3748 Views

Outline the positive and negative effects of urban sprawl?

Define urban sprawl: urban sprawl is the outward growth of urban areas. As people move to urban areas the need for land to build on increases so the suburbs spread out.The positive effects are business ow...

Answered by Ella G. • Geography tutor

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